diff --git a/crates/ui-egui/src/i18n/ca.tsv b/crates/ui-egui/src/i18n/ca.tsv
index 592de77eed..882adefa39 100644
--- a/crates/ui-egui/src/i18n/ca.tsv
+++ b/crates/ui-egui/src/i18n/ca.tsv
@@ -5876,6 +5876,7 @@ digits	Malayalam	Malaiàlam
 @msg	no action set to save	no hi ha cap conjunt d’accions per desar
 @msg	the action set file can't be read in full	el fitxer de conjunt d’accions no es pot llegir sencer
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	S’ha carregat “{name}”: s’ha omès {n} pas|S’ha carregat “{name}”: s’han omès {n} passos
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	S’ha carregat “{name}”: {n} pas té una ordre desconeguda i s’ha conservat: “{action}”, pas {step}, `{command}`|S’ha carregat “{name}”: {n} passos tenen ordres desconegudes i s’han conservat; el primer: “{action}”, pas {step}, `{command}`
 @msg	not an action set file	no és un fitxer de conjunt d’accions
 @msg	the action set file is larger than 8 MiB	el fitxer de conjunt d’accions supera els 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: la referència superaria els {MAX_BYTES} bytes
@@ -6367,6 +6368,7 @@ digits	Malayalam	Malaiàlam
 @msg	truncated	truncat
 @msg	Unembedded to {_1}	S’ha desincrustat a {_1}
 @msg	unknown command `{0}`	ordre desconeguda `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	el pas {step} de “{action}” executa l’ordre desconeguda `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	ordre desconeguda `{0}`; volies dir `{1}`?
 @msg	unknown control `{name}`: fillStroke, coloring, drawMode or screenMode	control desconegut `{name}`: fillStroke, coloring, drawMode o screenMode
 @msg	Unknown dimension mode	Mode de dimensió desconegut
diff --git a/crates/ui-egui/src/i18n/cs.tsv b/crates/ui-egui/src/i18n/cs.tsv
index bde13aa090..d95879fc03 100644
--- a/crates/ui-egui/src/i18n/cs.tsv
+++ b/crates/ui-egui/src/i18n/cs.tsv
@@ -5055,6 +5055,7 @@ imageTrace	Outline	Obrys
 @msg	no action set to save	žádná sada akcí k uložení
 @msg	the action set file can't be read in full	soubor sady akcí nelze přečíst celý
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	Načteno „{name}“: vynechán {n} krok|Načteno „{name}“: vynechány {n} kroky|Načteno „{name}“: vynecháno {n} kroků
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	Načteno „{name}“: {n} krok má neznámý příkaz a byl ponechán: „{action}“, krok {step}, `{command}`|Načteno „{name}“: {n} kroky mají neznámé příkazy a byly ponechány; první: „{action}“, krok {step}, `{command}`|Načteno „{name}“: {n} kroků má neznámé příkazy a bylo ponecháno; první: „{action}“, krok {step}, `{command}`
 @msg	not an action set file	není to soubor sady akcí
 @msg	the action set file is larger than 8 MiB	soubor sady akcí je větší než 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: reference by byla větší než {MAX_BYTES} bajtů
@@ -5295,6 +5296,7 @@ imageTrace	Outline	Obrys
 @msg	tool shortcuts must be a single key (optionally with Shift)	zkratky nástrojů musí být jediná klávesa (volitelně se Shift)
 @msg	truncated	zkráceno
 @msg	unknown command `{0}`	neznámý příkaz `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	krok {step} akce „{action}“ spouští neznámý příkaz `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	neznámý příkaz `{0}`; mysleli jste `{1}`?
 @msg	unknown effect `{id}`	neznámý efekt `{id}`
 @msg	unknown format	neznámý formát
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index 906a3bdbf9..d98afe5b03 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -4669,6 +4669,7 @@ theme	Appearance	Erscheinungsbild
 @msg	no action set to save	kein Aktionssatz zum Speichern
 @msg	the action set file can't be read in full	die Aktionssatzdatei kann nicht vollständig gelesen werden
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	„{name}“ geladen: {n} Schritt wurde ausgelassen|„{name}“ geladen: {n} Schritte wurden ausgelassen
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	„{name}“ geladen: {n} Schritt hat einen unbekannten Befehl und wurde behalten: „{action}“, Schritt {step}, `{command}`|„{name}“ geladen: {n} Schritte haben unbekannte Befehle und wurden behalten; der erste: „{action}“, Schritt {step}, `{command}`
 @msg	not an action set file	keine Aktionssatzdatei
 @msg	the action set file is larger than 8 MiB	die Aktionssatzdatei ist größer als 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: die Referenz wäre größer als {MAX_BYTES} Byte
@@ -4910,6 +4911,7 @@ theme	Appearance	Erscheinungsbild
 @msg	tool shortcuts must be a single key (optionally with Shift)	Tastaturbefehle für Werkzeuge müssen aus einer einzelnen Taste bestehen (optional mit Shift)
 @msg	truncated	abgeschnitten
 @msg	unknown command `{0}`	unbekannter Befehl `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	Schritt {step} von „{action}“ führt den unbekannten Befehl `{command}` aus
 @msg	unknown command `{0}`; did you mean `{1}`?	unbekannter Befehl `{0}`; meinten Sie `{1}`?
 @msg	unknown effect `{id}`	unbekannter Effekt `{id}`
 @msg	unknown format	unbekanntes Format
diff --git a/crates/ui-egui/src/i18n/el.tsv b/crates/ui-egui/src/i18n/el.tsv
index 776c992e7c..8facc3b3dd 100644
--- a/crates/ui-egui/src/i18n/el.tsv
+++ b/crates/ui-egui/src/i18n/el.tsv
@@ -4701,6 +4701,7 @@ digits	Malayalam	Μαλαγιάλαμ
 @msg	no action set to save	δεν υπάρχει σύνολο ενεργειών για αποθήκευση
 @msg	the action set file can't be read in full	το αρχείο συνόλου ενεργειών δεν μπορεί να διαβαστεί ολόκληρο
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	Φορτώθηκε το «{name}»: παραλείφθηκε {n} βήμα|Φορτώθηκε το «{name}»: παραλείφθηκαν {n} βήματα
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	Φορτώθηκε το «{name}»: {n} βήμα έχει άγνωστη εντολή και διατηρήθηκε: «{action}», βήμα {step}, `{command}`|Φορτώθηκε το «{name}»: {n} βήματα έχουν άγνωστες εντολές και διατηρήθηκαν· το πρώτο: «{action}», βήμα {step}, `{command}`
 @msg	not an action set file	δεν είναι αρχείο συνόλου ενεργειών
 @msg	the action set file is larger than 8 MiB	το αρχείο συνόλου ενεργειών είναι μεγαλύτερο από 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: η αναφορά θα ήταν μεγαλύτερη από {MAX_BYTES} byte
@@ -4935,6 +4936,7 @@ digits	Malayalam	Μαλαγιάλαμ
 @msg	tool shortcuts must be a single key (optionally with Shift)	οι συντομεύσεις εργαλείων πρέπει να περιλαμβάνουν ένα πλήκτρο (προαιρετικά με Shift)
 @msg	truncated	περικομμένο
 @msg	unknown command `{0}`	άγνωστη εντολή `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	το βήμα {step} της ενέργειας «{action}» εκτελεί την άγνωστη εντολή `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	άγνωστη εντολή `{0}`· μήπως εννοείτε `{1}`;
 @msg	unknown effect `{id}`	άγνωστο εφέ `{id}`
 @msg	unknown format	άγνωστη μορφή
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index 935d011e72..3de5287c48 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -4745,6 +4745,7 @@ axis	Both	Ambos
 @msg	no action set to save	no hay ningún conjunto de acciones que guardar
 @msg	the action set file can't be read in full	el archivo de conjunto de acciones no se puede leer completo
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	Se cargó “{name}”: se omitió {n} paso|Se cargó “{name}”: se omitieron {n} pasos
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	Se cargó “{name}”: {n} paso tiene un comando desconocido y se conservó: “{action}”, paso {step}, `{command}`|Se cargó “{name}”: {n} pasos tienen comandos desconocidos y se conservaron; el primero: “{action}”, paso {step}, `{command}`
 @msg	not an action set file	no es un archivo de conjunto de acciones
 @msg	the action set file is larger than 8 MiB	el archivo de conjunto de acciones supera los 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: la referencia superaría los {MAX_BYTES} bytes
@@ -4986,6 +4987,7 @@ axis	Both	Ambos
 @msg	tool shortcuts must be a single key (optionally with Shift)	los atajos de herramientas deben ser una sola tecla (opcionalmente con Shift)
 @msg	truncated	truncado
 @msg	unknown command `{0}`	comando desconocido `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	el paso {step} de “{action}” ejecuta el comando desconocido `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	comando desconocido `{0}`; ¿quiso decir `{1}`?
 @msg	unknown effect `{id}`	efecto desconocido `{id}`
 @msg	unknown format	formato desconocido
diff --git a/crates/ui-egui/src/i18n/fi.tsv b/crates/ui-egui/src/i18n/fi.tsv
index 684589a9a1..d06a0bb02b 100644
--- a/crates/ui-egui/src/i18n/fi.tsv
+++ b/crates/ui-egui/src/i18n/fi.tsv
@@ -4961,6 +4961,7 @@ imageTrace	Outline	Ääriviiva
 @msg	no action set to save	ei tallennettavaa toimintosarjaa
 @msg	the action set file can't be read in full	toimintosarjatiedostoa ei voi lukea kokonaan
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	Ladattiin ”{name}”: jätettiin pois {n} vaihe|Ladattiin ”{name}”: jätettiin pois {n} vaihetta
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	Ladattiin ”{name}”: {n} vaiheella on tuntematon komento, ja se säilytettiin: ”{action}”, vaihe {step}, `{command}`|Ladattiin ”{name}”: {n} vaiheella on tuntemattomia komentoja, ja ne säilytettiin; ensimmäinen: ”{action}”, vaihe {step}, `{command}`
 @msg	not an action set file	ei ole toimintosarjatiedosto
 @msg	the action set file is larger than 8 MiB	toimintosarjatiedosto on suurempi kuin 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: viite olisi suurempi kuin {MAX_BYTES} tavua
@@ -5194,6 +5195,7 @@ imageTrace	Outline	Ääriviiva
 @msg	tool shortcuts must be a single key (optionally with Shift)	työkalujen pikanäppäinten on oltava yksittäinen näppäin (valinnaisesti Vaihto-näppäimen kanssa)
 @msg	truncated	katkaistu
 @msg	unknown command `{0}`	tuntematon komento `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	toiminnon ”{action}” vaihe {step} suorittaa tuntemattoman komennon `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	tuntematon komento `{0}`; tarkoititko `{1}`?
 @msg	unknown effect `{id}`	tuntematon tehoste `{id}`
 @msg	unknown format	tuntematon muoto
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index 9ceca79c90..3dfd5ad5d9 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -4734,6 +4734,7 @@ axis	Both	Les deux
 @msg	no action set to save	aucun jeu de scripts à enregistrer
 @msg	the action set file can't be read in full	le fichier de jeu de scripts ne peut pas être lu en entier
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	« {name} » chargé : {n} étape a été ignorée|« {name} » chargé : {n} étapes ont été ignorées
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	« {name} » chargé : {n} étape a une commande inconnue et a été conservée : « {action} », étape {step}, `{command}`|« {name} » chargé : {n} étapes ont des commandes inconnues et ont été conservées ; la première : « {action} », étape {step}, `{command}`
 @msg	not an action set file	ce n’est pas un fichier de jeu de scripts
 @msg	the action set file is larger than 8 MiB	le fichier de jeu de scripts dépasse 8 Mio
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}` : la référence dépasserait {MAX_BYTES} octets
@@ -4975,6 +4976,7 @@ axis	Both	Les deux
 @msg	tool shortcuts must be a single key (optionally with Shift)	les raccourcis d’outils doivent être une seule touche (éventuellement avec Maj)
 @msg	truncated	tronqué
 @msg	unknown command `{0}`	commande inconnue `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	l’étape {step} de « {action} » exécute la commande inconnue `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	commande inconnue `{0}` ; vouliez-vous dire `{1}` ?
 @msg	unknown effect `{id}`	effet inconnu `{id}`
 @msg	unknown format	format inconnu
diff --git a/crates/ui-egui/src/i18n/hi.tsv b/crates/ui-egui/src/i18n/hi.tsv
index 64873c5e2d..3c77aa0a99 100644
--- a/crates/ui-egui/src/i18n/hi.tsv
+++ b/crates/ui-egui/src/i18n/hi.tsv
@@ -7520,6 +7520,7 @@ antiAlias	Sharp	शार्प
 @msg	not a Word document: its WordDocument stream doesn't start with a file information block	वर्ड डॉक्यूमेंट नहीं: इसकी WordDocument धारा फ़ाइल सूचना ब्लॉक के साथ शुरू नहीं होती है
 @msg	the action set file can't be read in full	एक्शन सेट फ़ाइल पूरी तरह नहीं पढ़ी जा सकती
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	“{name}” लोड किया गया: {n} चरण छोड़ा गया|“{name}” लोड किया गया: {n} चरण छोड़े गए
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	“{name}” लोड किया गया: {n} चरण में अज्ञात आदेश है और उसे रखा गया: “{action}”, चरण {step}, `{command}`|“{name}” लोड किया गया: {n} चरणों में अज्ञात आदेश हैं और उन्हें रखा गया; पहला: “{action}”, चरण {step}, `{command}`
 @msg	not an action set file	एक एक्शन सेट फ़ाइल नहीं
 @msg	not an EMF or WMF file	नहीं एक EMF या WMF फ़ाइल
 @msg	not an HP-GL file	HP-GL फ़ाइल नहीं है
@@ -8410,6 +8411,7 @@ antiAlias	Sharp	शार्प
 @msg	unknown character style number field	अज्ञात चरित्र स्टाइल संख्या क्षेत्र
 @msg	unknown CMYK profile `{name}`	अज्ञात CMYK प्रोफ़ाइल `{name}`
 @msg	unknown command `{0}`	अज्ञात आदेश `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	“{action}” का चरण {step} अज्ञात आदेश `{command}` चलाता है
 @msg	unknown command `{0}`; did you mean `{1}`?	अज्ञात आदेश `{0}`; क्या आपको `{1}` का मतलब है?
 @msg	unknown control `{name}`: fillStroke, coloring, drawMode or screenMode	अज्ञात नियंत्रण `{name}`: fillStroke, रंग, drawMode या screenMode
 @msg	Unknown dimension mode	अज्ञात आयाम मोड
diff --git a/crates/ui-egui/src/i18n/hu.tsv b/crates/ui-egui/src/i18n/hu.tsv
index ddf2acf4c0..c4cdb9d544 100644
--- a/crates/ui-egui/src/i18n/hu.tsv
+++ b/crates/ui-egui/src/i18n/hu.tsv
@@ -5434,6 +5434,7 @@ imageTrace	Outline	Körvonal
 @msg	no action set to save	nincs menthető műveletkészlet
 @msg	the action set file can't be read in full	a műveletkészlet-fájl nem olvasható be teljesen
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	„{name}” betöltve; kihagyott lépések: {n}
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	„{name}” betöltve; megtartott lépések ismeretlen paranccsal: {n}; az első: „{action}”, lépés: {step}, `{command}`
 @msg	not an action set file	nem műveletkészlet-fájl
 @msg	the action set file is larger than 8 MiB	a műveletkészlet-fájl nagyobb 8 MiB-nál
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: a referencia nagyobb lenne {MAX_BYTES} bájtnál
@@ -5807,6 +5808,7 @@ imageTrace	Outline	Körvonal
 @msg	truncated	csonka
 @msg	Unembedded to {_1}	Beágyazás megszüntetve, ide: {_1}
 @msg	unknown command `{0}`	ismeretlen parancs: `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	„{action}”, lépés: {step}: ismeretlen parancsot futtat: `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	ismeretlen parancs: `{0}`; erre gondolt: `{1}`?
 @msg	unknown effect `{id}`	ismeretlen effektus: `{id}`
 @msg	unknown format	ismeretlen formátum
diff --git a/crates/ui-egui/src/i18n/it.tsv b/crates/ui-egui/src/i18n/it.tsv
index 1252743764..534a7a181f 100644
--- a/crates/ui-egui/src/i18n/it.tsv
+++ b/crates/ui-egui/src/i18n/it.tsv
@@ -4797,6 +4797,7 @@ axis	Both	Entrambi
 @msg	no action set to save	nessun set di azioni da salvare
 @msg	the action set file can't be read in full	il file di set di azioni non può essere letto per intero
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	Caricato “{name}”: {n} passaggio è stato omesso|Caricato “{name}”: {n} passaggi sono stati omessi
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	Caricato “{name}”: {n} passaggio ha un comando sconosciuto ed è stato mantenuto: “{action}”, passaggio {step}, `{command}`|Caricato “{name}”: {n} passaggi hanno comandi sconosciuti e sono stati mantenuti; il primo: “{action}”, passaggio {step}, `{command}`
 @msg	not an action set file	non è un file di set di azioni
 @msg	the action set file is larger than 8 MiB	il file del set di azioni supera 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: il riferimento supererebbe {MAX_BYTES} byte
@@ -5038,6 +5039,7 @@ axis	Both	Entrambi
 @msg	tool shortcuts must be a single key (optionally with Shift)	le scelte rapide degli strumenti devono essere un singolo tasto (eventualmente con Shift)
 @msg	truncated	troncato
 @msg	unknown command `{0}`	comando sconosciuto `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	il passaggio {step} di “{action}” esegue il comando sconosciuto `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	comando sconosciuto `{0}`; forse intendevate `{1}`?
 @msg	unknown effect `{id}`	effetto sconosciuto `{id}`
 @msg	unknown format	formato sconosciuto
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index 97a91c1ed2..98a188ee02 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -4715,6 +4715,7 @@ swatch	Bright Violet	ビビッドバイオレット
 @msg	objects can't be nested more than 32 deep	オブジェクトは 32 階層より深く入れ子にできません
 @msg	the SVG's elements are nested more than {0} deep	SVG の要素が {0} 階層より深く入れ子になっています
 @msg	unknown command `{0}`	`{0}` は不明なコマンドです
+@msg	step {step} of “{action}” runs the unknown command `{command}`	「{action}」のステップ {step} は不明なコマンド `{command}` を実行します
 @msg	unknown command `{0}`; did you mean `{1}`?	`{0}` は不明なコマンドです。`{1}` のことですか?
 @msg	`{what}` closes nothing	`{what}` に対応する開始部分がありません
 @msg	`{what}` closes something it didn't open	`{what}` が対応しない開始部分を閉じています
@@ -5064,6 +5065,7 @@ swatch	Bright Violet	ビビッドバイオレット
 @msg	no action set to save	保存するアクションセットがありません
 @msg	the action set file can't be read in full	アクションセットファイルをすべて読み込めません
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	「{name}」を読み込みました。{n} 個のステップは省きました
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	「{name}」を読み込みました。不明なコマンドのステップ {n} 個はそのまま残しました。最初は「{action}」のステップ {step}、`{command}` です
 @msg	not an action set file	アクションセットファイルではありません
 @msg	the action set file is larger than 8 MiB	アクションセットファイルが 8 MiB を超えています
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: リファレンスが {MAX_BYTES} バイトを超えます
diff --git a/crates/ui-egui/src/i18n/ka.tsv b/crates/ui-egui/src/i18n/ka.tsv
index 9891fa66f2..f2d20fc031 100644
--- a/crates/ui-egui/src/i18n/ka.tsv
+++ b/crates/ui-egui/src/i18n/ka.tsv
@@ -4425,6 +4425,7 @@ font-technology	Variable	ცვლადი
 @msg	no action set to save	შესანახი მოქმედებების ნაკრები არ არის
 @msg	the action set file can't be read in full	მოქმედებების ნაკრების ფაილის სრულად წაკითხვა შეუძლებელია
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	ჩაიტვირთა „{name}“; გამოტოვებული ნაბიჯები: {n}
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	ჩაიტვირთა „{name}“; შენახული ნაბიჯები უცნობი ბრძანებით: {n}; პირველი: „{action}“, ნაბიჯი {step}, `{command}`
 @msg	not an action set file	ეს არ არის მოქმედებების ნაკრების ფაილი
 @msg	the action set file is larger than 8 MiB	მოქმედებების ნაკრების ფაილი 8 MiB-ზე დიდია
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: ცნობარი {MAX_BYTES} ბაიტზე დიდი იქნებოდა
@@ -4644,6 +4645,7 @@ font-technology	Variable	ცვლადი
 @msg	tool shortcuts must be a single key (optionally with Shift)	ხელსაწყოს მალსახმობი ერთი კლავიში უნდა იყოს (სურვილისამებრ Shift-ით)
 @msg	truncated	შეკვეცილია
 @msg	unknown command `{0}`	უცნობი ბრძანება `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	„{action}“, ნაბიჯი {step}: უცნობი ბრძანება `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	უცნობი ბრძანება `{0}`; იქნებ `{1}` იგულისხმეთ?
 @msg	unknown effect `{id}`	უცნობი ეფექტი `{id}`
 @msg	unknown format	უცნობი ფორმატი
diff --git a/crates/ui-egui/src/i18n/ko.tsv b/crates/ui-egui/src/i18n/ko.tsv
index 0cdcda85c8..8af8d3f53d 100644
--- a/crates/ui-egui/src/i18n/ko.tsv
+++ b/crates/ui-egui/src/i18n/ko.tsv
@@ -4642,6 +4642,7 @@ theme	Appearance	외관
 @msg	objects can't be nested more than 32 deep	개체는 32단계보다 깊게 중첩할 수 없습니다
 @msg	the SVG's elements are nested more than {0} deep	SVG 요소가 {0}단계보다 깊게 중첩되어 있습니다
 @msg	unknown command `{0}`	알 수 없는 명령 `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	“{action}”의 단계 {step}에서 알 수 없는 명령 `{command}`을(를) 실행합니다
 @msg	unknown command `{0}`; did you mean `{1}`?	알 수 없는 명령 `{0}`: `{1}`을(를) 의미하셨습니까?
 @msg	`{what}` closes nothing	`{what}`이(가) 닫는 항목이 없습니다
 @msg	`{what}` closes something it didn't open	`{what}`이(가) 열지 않은 항목을 닫습니다
@@ -4991,6 +4992,7 @@ theme	Appearance	외관
 @msg	no action set to save	저장할 액션 세트가 없습니다
 @msg	the action set file can't be read in full	액션 세트 파일을 전부 읽을 수 없습니다
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	“{name}”을(를) 불러왔습니다. 단계 {n}개를 제외했습니다
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	“{name}”을(를) 불러왔습니다. 알 수 없는 명령이 있는 단계 {n}개를 그대로 두었습니다. 첫 번째: “{action}”, 단계 {step}, `{command}`
 @msg	not an action set file	액션 세트 파일이 아닙니다
 @msg	the action set file is larger than 8 MiB	액션 세트 파일이 8 MiB보다 큽니다
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: 참조가 {MAX_BYTES}바이트보다 커집니다
diff --git a/crates/ui-egui/src/i18n/nl.tsv b/crates/ui-egui/src/i18n/nl.tsv
index de753d62b2..c8b777d01b 100644
--- a/crates/ui-egui/src/i18n/nl.tsv
+++ b/crates/ui-egui/src/i18n/nl.tsv
@@ -5112,6 +5112,7 @@ imageTrace	Outline	Contour
 @msg	no action set to save	geen actieset om op te slaan
 @msg	the action set file can't be read in full	het actiesetbestand kan niet volledig worden gelezen
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	„{name}” geladen: {n} stap is weggelaten|„{name}” geladen: {n} stappen zijn weggelaten
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	„{name}” geladen: {n} stap heeft een onbekende opdracht en is behouden: „{action}”, stap {step}, `{command}`|„{name}” geladen: {n} stappen hebben onbekende opdrachten en zijn behouden; de eerste: „{action}”, stap {step}, `{command}`
 @msg	not an action set file	geen actiesetbestand
 @msg	the action set file is larger than 8 MiB	het actiesetbestand is groter dan 8 MiB
 @msg	the action set file holds more than 1,000 actions	het actiesetbestand bevat meer dan 1.000 acties
@@ -5313,6 +5314,7 @@ imageTrace	Outline	Contour
 @msg	tool shortcuts must be a single key (optionally with Shift)	gereedschapsneltoetsen moeten uit één toets bestaan (eventueel met Shift)
 @msg	truncated	afgekapt
 @msg	unknown command `{0}`	onbekende opdracht `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	stap {step} van „{action}” voert de onbekende opdracht `{command}` uit
 @msg	unknown command `{0}`; did you mean `{1}`?	onbekende opdracht `{0}`; bedoelde je `{1}`?
 @msg	unknown effect `{id}`	onbekend effect `{id}`
 @msg	unknown format	onbekende indeling
diff --git a/crates/ui-egui/src/i18n/pl.tsv b/crates/ui-egui/src/i18n/pl.tsv
index 891e916724..1c49a7327a 100644
--- a/crates/ui-egui/src/i18n/pl.tsv
+++ b/crates/ui-egui/src/i18n/pl.tsv
@@ -4879,6 +4879,7 @@ imageTrace	Outline	Kontur
 @msg	no action set to save	brak zestawu operacji do zapisania
 @msg	the action set file can't be read in full	nie można odczytać całego pliku zestawu operacji
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	Wczytano „{name}”: pominięto {n} krok|Wczytano „{name}”: pominięto {n} kroki|Wczytano „{name}”: pominięto {n} kroków
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	Wczytano „{name}”: {n} krok ma nieznane polecenie i został zachowany: „{action}”, krok {step}, `{command}`|Wczytano „{name}”: {n} kroki mają nieznane polecenia i zostały zachowane; pierwszy: „{action}”, krok {step}, `{command}`|Wczytano „{name}”: {n} kroków ma nieznane polecenia i zostało zachowanych; pierwszy: „{action}”, krok {step}, `{command}`
 @msg	not an action set file	to nie jest plik zestawu operacji
 @msg	the action set file is larger than 8 MiB	plik zestawu operacji jest większy niż 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: dokumentacja byłaby większa niż {MAX_BYTES} bajtów
@@ -5122,6 +5123,7 @@ imageTrace	Outline	Kontur
 @msg	tool shortcuts must be a single key (optionally with Shift)	skróty narzędzi muszą być pojedynczym klawiszem (opcjonalnie z Shift)
 @msg	truncated	obcięty
 @msg	unknown command `{0}`	nieznane polecenie `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	krok {step} operacji „{action}” uruchamia nieznane polecenie `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	nieznane polecenie `{0}`; czy chodziło o `{1}`?
 @msg	unknown effect `{id}`	nieznany efekt `{id}`
 @msg	unknown format	nieznany format
diff --git a/crates/ui-egui/src/i18n/pt-br.tsv b/crates/ui-egui/src/i18n/pt-br.tsv
index e45bf18d42..12647b2884 100644
--- a/crates/ui-egui/src/i18n/pt-br.tsv
+++ b/crates/ui-egui/src/i18n/pt-br.tsv
@@ -4199,6 +4199,7 @@ axis	Both	Ambos
 @msg	no action set to save	nenhum conjunto de ações para salvar
 @msg	the action set file can't be read in full	o arquivo de conjunto de ações não pode ser lido por inteiro
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	“{name}” carregado: {n} etapa foi omitida|“{name}” carregado: {n} etapas foram omitidas
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	“{name}” carregado: {n} etapa tem um comando desconhecido e foi mantida: “{action}”, etapa {step}, `{command}`|“{name}” carregado: {n} etapas têm comandos desconhecidos e foram mantidas; a primeira: “{action}”, etapa {step}, `{command}`
 @msg	not an action set file	não é um arquivo de conjunto de ações
 @msg	the action set file is larger than 8 MiB	o arquivo de conjunto de ações tem mais de 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: a referência teria mais de {MAX_BYTES} bytes
@@ -4438,6 +4439,7 @@ axis	Both	Ambos
 @msg	tool shortcuts must be a single key (optionally with Shift)	os atalhos de ferramenta devem ser uma única tecla (opcionalmente com Shift)
 @msg	truncated	truncado
 @msg	unknown command `{0}`	comando desconhecido `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	a etapa {step} de “{action}” executa o comando desconhecido `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	comando desconhecido `{0}`; você quis dizer `{1}`?
 @msg	unknown effect `{id}`	efeito desconhecido `{id}`
 @msg	unknown format	formato desconhecido
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index b260a39c0f..b3ec6a7684 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -4782,6 +4782,7 @@ axis	Both	Оба
 @msg	no action set to save	нет набора действий для сохранения
 @msg	the action set file can't be read in full	файл набора действий невозможно прочитать целиком
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	Загружено «{name}»: пропущен {n} шаг|Загружено «{name}»: пропущено {n} шага|Загружено «{name}»: пропущено {n} шагов
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	Загружено «{name}»: {n} шаг с неизвестной командой сохранён: «{action}», шаг {step}, `{command}`|Загружено «{name}»: {n} шага с неизвестными командами сохранены; первый: «{action}», шаг {step}, `{command}`|Загружено «{name}»: {n} шагов с неизвестными командами сохранены; первый: «{action}», шаг {step}, `{command}`
 @msg	not an action set file	это не файл набора действий
 @msg	the action set file is larger than 8 MiB	файл набора действий больше 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: справочник был бы больше {MAX_BYTES} байт
@@ -5023,6 +5024,7 @@ axis	Both	Оба
 @msg	tool shortcuts must be a single key (optionally with Shift)	сочетания инструментов должны быть одной клавишей (необязательно с Shift)
 @msg	truncated	усечено
 @msg	unknown command `{0}`	неизвестная команда `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	шаг {step} действия «{action}» выполняет неизвестную команду `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	неизвестная команда `{0}`; возможно, имелась в виду `{1}`?
 @msg	unknown effect `{id}`	неизвестный эффект `{id}`
 @msg	unknown format	неизвестный формат
diff --git a/crates/ui-egui/src/i18n/sv.tsv b/crates/ui-egui/src/i18n/sv.tsv
index 3854b8d56f..e16a0cb6e1 100644
--- a/crates/ui-egui/src/i18n/sv.tsv
+++ b/crates/ui-egui/src/i18n/sv.tsv
@@ -4645,6 +4645,7 @@ axis	Both	Båda
 @msg	no action set to save	ingen åtgärdsuppsättning att spara
 @msg	the action set file can't be read in full	filen med åtgärdsuppsättning kan inte läsas helt
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	Läste in ”{name}”: {n} steg utelämnades|Läste in ”{name}”: {n} steg utelämnades
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	Läste in ”{name}”: {n} steg har ett okänt kommando och behölls: ”{action}”, steg {step}, `{command}`|Läste in ”{name}”: {n} steg har okända kommandon och behölls; det första: ”{action}”, steg {step}, `{command}`
 @msg	not an action set file	inte en fil med åtgärdsuppsättning
 @msg	the action set file is larger than 8 MiB	filen med åtgärdsuppsättningen är större än 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: referensen skulle bli större än {MAX_BYTES} byte
@@ -4879,6 +4880,7 @@ axis	Both	Båda
 @msg	tool shortcuts must be a single key (optionally with Shift)	kortkommandon för verktyg måste vara en enda tangent (eventuellt med Shift)
 @msg	truncated	avkortad
 @msg	unknown command `{0}`	okänt kommando `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	steg {step} i ”{action}” kör det okända kommandot `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	okänt kommando `{0}`; menade du `{1}`?
 @msg	unknown effect `{id}`	okänd effekt `{id}`
 @msg	unknown format	okänt format
diff --git a/crates/ui-egui/src/i18n/tests.rs b/crates/ui-egui/src/i18n/tests.rs
index e51e321781..c303810eb9 100644
--- a/crates/ui-egui/src/i18n/tests.rs
+++ b/crates/ui-egui/src/i18n/tests.rs
@@ -2524,6 +2524,10 @@ const COUNTED_STATUS_MESSAGES: &[(&str, &str)] = &[
     ("Downloaded 1 file", "Downloaded 2 files"),
     ("Exported 1 file to /out", "Exported 2 files to /out"),
     ("Loaded “Tidy”: 1 step was left out", "Loaded “Tidy”: 2 steps were left out"),
+    (
+        "Loaded “Tidy”: 1 step has an unknown command and was kept: “Export”, step 4, `example.finish`",
+        "Loaded “Tidy”: 2 steps have unknown commands and were kept; the first: “Export”, step 4.2, `example.finish`",
+    ),
 ];
 
 /// The link, font, export and action set status messages name a count of 1 in the singular and other counts in
diff --git a/crates/ui-egui/src/i18n/tr.tsv b/crates/ui-egui/src/i18n/tr.tsv
index 17575e2732..26822bf63e 100644
--- a/crates/ui-egui/src/i18n/tr.tsv
+++ b/crates/ui-egui/src/i18n/tr.tsv
@@ -4479,6 +4479,7 @@ axis	Both	Her İkisi
 @msg	no action set to save	kaydedilecek eylem seti yok
 @msg	the action set file can't be read in full	eylem seti dosyası tamamen okunamıyor
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	“{name}” yüklendi: {n} adım atlandı
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	“{name}” yüklendi: bilinmeyen komutlu {n} adım korundu; ilki: “{action}”, adım {step}, `{command}`
 @msg	not an action set file	bir eylem seti dosyası değil
 @msg	the action set file is larger than 8 MiB	eylem seti dosyası 8 MiB'den büyük
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: başvuru {MAX_BYTES} bayttan büyük olur
@@ -4702,6 +4703,7 @@ axis	Both	Her İkisi
 @msg	tool shortcuts must be a single key (optionally with Shift)	araç kısayolları tek tuş olmalıdır (isteğe bağlı olarak Shift ile)
 @msg	truncated	kesik
 @msg	unknown command `{0}`	bilinmeyen komut `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	“{action}” eylemi, adım {step}: bilinmeyen `{command}` komutunu çalıştırıyor
 @msg	unknown command `{0}`; did you mean `{1}`?	bilinmeyen komut `{0}`; `{1}` mi demek istediniz?
 @msg	unknown effect `{id}`	bilinmeyen etki `{id}`
 @msg	unknown format	bilinmeyen format
diff --git a/crates/ui-egui/src/i18n/uk.tsv b/crates/ui-egui/src/i18n/uk.tsv
index a92fb0329b..aa8d0c56f9 100644
--- a/crates/ui-egui/src/i18n/uk.tsv
+++ b/crates/ui-egui/src/i18n/uk.tsv
@@ -4781,6 +4781,7 @@ axis	Both	Обидві
 @msg	no action set to save	немає набору дій для збереження
 @msg	the action set file can't be read in full	файл набору дій неможливо прочитати повністю
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	Завантажено «{name}»: пропущено {n} крок|Завантажено «{name}»: пропущено {n} кроки|Завантажено «{name}»: пропущено {n} кроків
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	Завантажено «{name}»: {n} крок із невідомою командою збережено: «{action}», крок {step}, `{command}`|Завантажено «{name}»: {n} кроки з невідомими командами збережено; перший: «{action}», крок {step}, `{command}`|Завантажено «{name}»: {n} кроків із невідомими командами збережено; перший: «{action}», крок {step}, `{command}`
 @msg	not an action set file	це не файл набору дій
 @msg	the action set file is larger than 8 MiB	файл набору дій більший за 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: довідник був би більшим за {MAX_BYTES} байтів
@@ -5022,6 +5023,7 @@ axis	Both	Обидві
 @msg	tool shortcuts must be a single key (optionally with Shift)	поєднання інструментів має бути однією клавішею (необов’язково з Shift)
 @msg	truncated	усічено
 @msg	unknown command `{0}`	невідома команда `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	крок {step} дії «{action}» виконує невідому команду `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	невідома команда `{0}`; можливо, ви мали на увазі `{1}`?
 @msg	unknown effect `{id}`	невідомий ефект `{id}`
 @msg	unknown format	невідомий формат
diff --git a/crates/ui-egui/src/i18n/vi.tsv b/crates/ui-egui/src/i18n/vi.tsv
index 2f53625bf8..7b7480cbfd 100644
--- a/crates/ui-egui/src/i18n/vi.tsv
+++ b/crates/ui-egui/src/i18n/vi.tsv
@@ -5094,6 +5094,7 @@ theme	Appearance	Giao diện
 @msg	no action set to save	không có bộ hành động nào để lưu
 @msg	the action set file can't be read in full	không thể đọc hết tệp bộ hành động
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	Đã tải “{name}”: bỏ qua {n} bước
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	Đã tải “{name}”: giữ lại {n} bước có lệnh không xác định; bước đầu tiên: “{action}”, bước {step}, `{command}`
 @msg	not an action set file	không phải tệp bộ hành động
 @msg	the action set file is larger than 8 MiB	tệp bộ hành động lớn hơn 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`: tài liệu tham khảo sẽ lớn hơn {MAX_BYTES} byte
@@ -5535,6 +5536,7 @@ theme	Appearance	Giao diện
 @msg	truncated	bị cắt ngắn
 @msg	Unembedded to {_1}	Đã bỏ nhúng vào {_1}
 @msg	unknown command `{0}`	lệnh không xác định `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	bước {step} của “{action}” chạy lệnh không xác định `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	lệnh không xác định `{0}`; ý bạn là `{1}`?
 @msg	unknown effect `{id}`	hiệu ứng không xác định `{id}`
 @msg	unknown format	định dạng không xác định
diff --git a/crates/ui-egui/src/i18n/zh-hans.tsv b/crates/ui-egui/src/i18n/zh-hans.tsv
index 8a7b09aa41..e1ec9f659c 100644
--- a/crates/ui-egui/src/i18n/zh-hans.tsv
+++ b/crates/ui-egui/src/i18n/zh-hans.tsv
@@ -4409,6 +4409,7 @@ imageTrace	Outline	轮廓
 @msg	objects can't be nested more than 32 deep	对象的嵌套不能超过 32 层
 @msg	the SVG's elements are nested more than {0} deep	SVG 的元素嵌套超过 {0} 层
 @msg	unknown command `{0}`	未知命令 `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	“{action}”的步骤 {step} 运行未知命令 `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	未知命令 `{0}`；您是否想输入 `{1}`？
 @msg	`{what}` closes nothing	`{what}` 没有可结束的内容
 @msg	`{what}` closes something it didn't open	`{what}` 结束了并非由它开始的内容
@@ -4744,6 +4745,7 @@ imageTrace	Outline	轮廓
 @msg	no action set to save	没有要存储的动作组
 @msg	the action set file can't be read in full	无法完整读取动作组文件
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	已载入“{name}”：已略过 {n} 个步骤
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	已载入“{name}”：保留了 {n} 个含未知命令的步骤；第一个：“{action}”，步骤 {step}，`{command}`
 @msg	not an action set file	不是动作组文件
 @msg	the action set file is larger than 8 MiB	动作组文件大于 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`：参考将大于 {MAX_BYTES} 字节
diff --git a/crates/ui-egui/src/i18n/zh-hant.tsv b/crates/ui-egui/src/i18n/zh-hant.tsv
index 4deead50de..264a252f18 100644
--- a/crates/ui-egui/src/i18n/zh-hant.tsv
+++ b/crates/ui-egui/src/i18n/zh-hant.tsv
@@ -2120,6 +2120,7 @@ file-filter	Templates	範本
 @msg	objects can't be nested more than 32 deep	物件的巢狀層級不能超過 32 層
 @msg	the SVG's elements are nested more than {0} deep	SVG 的元素巢狀超過 {0} 層
 @msg	unknown command `{0}`	未知的指令 `{0}`
+@msg	step {step} of “{action}” runs the unknown command `{command}`	「{action}」的步驟 {step} 執行未知的指令 `{command}`
 @msg	unknown command `{0}`; did you mean `{1}`?	未知的指令 `{0}`；您是指 `{1}` 嗎？
 @msg	`{what}` closes nothing	`{what}` 沒有可結束的內容
 @msg	`{what}` closes something it didn't open	`{what}` 結束了並非由它開始的內容
@@ -2458,6 +2459,7 @@ file-filter	Templates	範本
 @msg	no action set to save	沒有要儲存的動作組
 @msg	the action set file can't be read in full	無法完整讀取動作組檔案
 @msgplural	Loaded “{name}”: {n} step was left out|Loaded “{name}”: {n} steps were left out	已載入「{name}」：已略過 {n} 個步驟
+@msgplural	Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`|Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`	已載入「{name}」：保留了 {n} 個含未知指令的步驟；第一個：「{action}」，步驟 {step}，`{command}`
 @msg	not an action set file	不是動作組檔案
 @msg	the action set file is larger than 8 MiB	動作組檔案大於 8 MiB
 @msg	`{ID}`: the reference would be larger than {MAX_BYTES} bytes	`{ID}`：參考將大於 {MAX_BYTES} 位元組
diff --git a/crates/ui-egui/src/panels/actions.rs b/crates/ui-egui/src/panels/actions.rs
index 20a57b7d63..eff4796601 100644
--- a/crates/ui-egui/src/panels/actions.rs
+++ b/crates/ui-egui/src/panels/actions.rs
@@ -85,6 +85,70 @@ impl Action {
             })
             .collect()
     }
+
+    /// The steps whose command `known` does not hold, in order, as (step index, the index of the
+    /// command in a `command.batch` step, command id). A `command.batch` step's own commands are
+    /// checked one by one, as playback runs them ([`Action::included_commands`]); a command of one
+    /// with no command id has the id "". With `included_only`, excluded steps are passed over.
+    pub(crate) fn unknown_commands<'a>(
+        &'a self,
+        known: &'a KnownCommands,
+        included_only: bool,
+    ) -> impl Iterator<Item = (usize, Option<usize>, &'a str)> + 'a {
+        self.steps.iter().enumerate().filter(move |(i, _)| !(included_only && self.excluded_steps.contains(i))).flat_map(
+            |(i, (command, params))| -> Vec<(usize, Option<usize>, &'a str)> {
+                match params.get("commands").and_then(Value::as_array) {
+                    Some(steps) if command == "command.batch" => steps
+                        .iter()
+                        .enumerate()
+                        .map(|(j, step)| (i, Some(j), step.get("command").and_then(Value::as_str).unwrap_or_default()))
+                        .filter(|(_, _, id)| !known.has(id))
+                        .collect(),
+                    _ if known.has(command) => vec![],
+                    _ => vec![(i, None, command.as_str())],
+                }
+            },
+        )
+    }
+}
+
+/// The command ids a step of an action can run now: the built-in engine commands, the commands the
+/// installed plug-ins add, the View menu commands the app plays itself ([`crate::menus::plays_in_app`])
+/// and stops ([`STOP_STEP`]).
+pub(crate) struct KnownCommands(std::collections::HashSet<&'static str>);
+
+impl KnownCommands {
+    /// The command ids known when it is called: a plug-in installed or removed later is not in it.
+    pub(crate) fn now() -> Self {
+        let engine = vectorcraft_engine::command_specs().iter().map(|c| c.id);
+        let plugins = vectorcraft_engine::cmd::plugin::command_specs().into_iter().map(|c| c.id);
+        Self(engine.chain(plugins).chain([STOP_STEP]).collect())
+    }
+
+    /// Whether a step can run command `id`.
+    pub(crate) fn has(&self, id: &str) -> bool {
+        self.0.contains(id) || crate::menus::plays_in_app(id)
+    }
+}
+
+/// The one-based place of a step that [`Action::unknown_commands`] gives: `3` for the third step,
+/// `3.2` for the second command of a `command.batch` third step.
+pub(crate) fn step_place(step: usize, in_batch: Option<usize>) -> String {
+    match in_batch {
+        Some(j) => format!("{}.{}", step + 1, j + 1),
+        None => (step + 1).to_string(),
+    }
+}
+
+/// `text` as a status message shows it: control characters become `�`, and text past 80
+/// characters ends in `…`.
+pub(crate) fn shown_text(text: &str) -> String {
+    const MAX: usize = 80;
+    let mut shown: String = text.chars().take(MAX).map(|c| if c.is_control() { '\u{fffd}' } else { c }).collect();
+    if text.chars().nth(MAX).is_some() {
+        shown.push('…');
+    }
+    shown
 }
 
 /// An action id no other action in this run has.
@@ -257,7 +321,10 @@ pub fn default_sets() -> Vec<ActionSet> {
 /// Accelerated runs every included step at once as a single undoable batch → what `command.batch`
 /// returns, {results}. Step by Step and Pause For run the first step now, each as its own undo step,
 /// and leave the rest to [`tick_playback`] → {results: [the first step's result], pending: the steps
-/// left}. While a paced playback is in progress, another action does not play.
+/// left}. While a paced playback is in progress, another action does not play. An action with an
+/// included step whose command is not known now ([`KnownCommands`]), a plug-in's command after the
+/// plug-in was removed for one, does not play: the error names the first such step and its command,
+/// and no step runs. An excluded step is not checked.
 ///
 /// An action with an included stop ([`STOP_STEP`]) plays up to the stop and waits there at any speed
 /// ([`continue_playback`]). At Accelerated, the steps between two stops are one undo step. → {results:
@@ -275,6 +342,13 @@ pub fn play(app: &mut VectorcraftApp, set: usize, idx: usize) -> Result<Value, S
     if app.ui.action_playing.is_some() {
         return Err("an action is already playing".into());
     }
+    // A step whose command is not known now would fail only when playback reaches it, after the
+    // steps before it changed the document.
+    let known = KnownCommands::now();
+    if let Some((step, in_batch, command)) = a.unknown_commands(&known, true).next() {
+        let (step, action, command) = (step_place(step, in_batch), shown_text(&a.name), shown_text(command));
+        return Err(format!("step {step} of “{action}” runs the unknown command `{command}`"));
+    }
     let options = app.ui.action_playback;
     if has_stop(&commands) {
         return play_with_stops(app, a.name, commands, options);
@@ -3907,6 +3981,112 @@ mod tests {
         assert_eq!(set_names(&app), before, "no set added");
     }
 
+    /// A step whose command is not known loads as it is, excluded or not and in a `command.batch`
+    /// step too, from `data` and from `path`: the answer lists each one and the status bar names the
+    /// first and how many there are. A set whose commands are all known loads with neither.
+    #[test]
+    fn load_actions_reports_steps_with_unknown_commands() {
+        let mut app = app_with_sets();
+        let files = with_files(&mut app, "/sets/unused.vcactions");
+        let batch = json!({"commands": [{"command": "object.move", "params": {"dx": 1, "dy": 0}}, {"command": "example.unknown.inner"}]});
+        let export = json!([
+            {"command": "object.move", "params": {"dx": 1, "dy": 0}},
+            {"command": "view.zoomIn", "params": {}},
+            {"command": STOP_STEP, "params": {"message": "", "allowContinue": false}},
+            {"command": "example.unknown.finish", "params": {"x": [1, 2]}},
+            {"command": "command.batch", "params": batch},
+            {"command": "example.unknown.off", "params": {}, "excluded": true},
+        ]);
+        let tidy = json!({"name": "Tidy", "steps": [{"command": "object.move", "params": {"dx": 1, "dy": 0}}]});
+        let file = json!({"format": "vcactions", "version": 6, "name": "Print", "actions": [tidy, {"name": "Export", "steps": export}]}).to_string();
+        let want = json!([
+            {"action": "Export", "actionIndex": 1, "step": 4, "stepIndex": 3, "command": "example.unknown.finish"},
+            {"action": "Export", "actionIndex": 1, "step": 5, "stepIndex": 4, "batchStep": 2, "command": "example.unknown.inner"},
+            {"action": "Export", "actionIndex": 1, "step": 6, "stepIndex": 5, "command": "example.unknown.off"},
+        ]);
+        let r = app.run(LOAD_SET, json!({"data": file})).unwrap();
+        assert_eq!(r, json!({"set": 3, "name": "Print", "actions": 2, "unknownCommands": want, "unknownCount": 3}));
+        assert_eq!(
+            app.ui.status,
+            "Loaded “Print”: 3 steps have unknown commands and were kept; the first: “Export”, step 4, `example.unknown.finish`"
+        );
+        let loaded = &app.ui.action_sets[3].actions[1];
+        assert_eq!(loaded.steps.len(), 6, "every step is kept");
+        assert_eq!(loaded.steps[3], ("example.unknown.finish".to_string(), json!({"x": [1, 2]})), "with its params");
+        assert_eq!(loaded.excluded_steps, BTreeSet::from([5]));
+        files.borrow_mut().insert("/sets/Print.vcactions".into(), file.into_bytes());
+        let r = app.run(LOAD_SET, json!({"path": "/sets/Print.vcactions"})).unwrap();
+        assert_eq!((r["name"].clone(), r["unknownCommands"].clone(), r["unknownCount"].clone()), (json!("Print 2"), want, json!(3)));
+        let saved = files::write_set(&app.ui.action_sets[4]);
+        assert!(saved.contains("example.unknown.finish") && saved.contains("example.unknown.inner"), "Save Actions… writes them back");
+        app.ui.status.clear();
+        let known = files::write_set(&app.ui.action_sets[1]);
+        assert_eq!(app.run(LOAD_SET, json!({"data": known})).unwrap(), json!({"set": 5, "name": "Mine 2", "actions": 2}));
+        assert_eq!(app.ui.status, "", "no message for a set whose commands are all known");
+        let empty = json!({"format": "vcactions", "version": 1, "name": "Empty", "actions": []}).to_string();
+        assert_eq!(app.run(LOAD_SET, json!({"data": empty})).unwrap(), json!({"set": 6, "name": "Empty", "actions": 0}));
+        assert_eq!(app.ui.status, "");
+    }
+
+    /// Load Actions… lists the first 1,000 steps with an unknown command and counts them all, and
+    /// the status bar shows an action name or command id with no control character and at most 80
+    /// characters, while the set and the answer keep them as they are. One step is named in the
+    /// singular.
+    #[test]
+    fn load_actions_bounds_what_it_reports_of_unknown_commands() {
+        let mut app = app_with_sets();
+        let steps = vec![json!({"command": "example.unknown"}); 1001];
+        let many = json!({"format": "vcactions", "version": 1, "name": "Many", "actions": [{"name": "A", "steps": steps}]});
+        let r = app.run(LOAD_SET, json!({"data": many.to_string()})).unwrap();
+        assert_eq!((r["unknownCommands"].as_array().map(Vec::len), r["unknownCount"].clone()), (Some(1000), json!(1001)));
+        assert_eq!(r["unknownCommands"][999], json!({"action": "A", "actionIndex": 0, "step": 1000, "stepIndex": 999, "command": "example.unknown"}));
+        let (name, id) = ("Odd\u{1b}[31m\nname", format!("example.\r\n{}", "x".repeat(200)));
+        let odd = json!({"format": "vcactions", "version": 1, "name": "Odd", "actions": [{"name": name, "steps": [{"command": id}]}]});
+        let r = app.run(LOAD_SET, json!({"data": odd.to_string()})).unwrap();
+        assert_eq!((r["unknownCommands"][0]["action"].clone(), r["unknownCommands"][0]["command"].clone()), (json!(name), json!(id)));
+        assert_eq!(app.ui.action_sets.last().unwrap().actions[0].steps[0].0, id, "the set keeps the id");
+        let shown_id = format!("example.\u{fffd}\u{fffd}{}…", "x".repeat(70));
+        assert_eq!(
+            app.ui.status,
+            format!("Loaded “Odd”: 1 step has an unknown command and was kept: “Odd\u{fffd}[31m\u{fffd}name”, step 1, `{shown_id}`")
+        );
+    }
+
+    /// An action with an included step whose command is not known does not play at any speed: no
+    /// step runs, and the error names the step, a `command.batch` step's command by its place in
+    /// the batch too. An excluded step with an unknown command does not stop it.
+    #[test]
+    fn an_action_with_an_unknown_command_does_not_play() {
+        let mut app = VectorcraftApp::new(Session::new(), Default::default());
+        app.run("file.new", json!({"width": 200, "height": 100})).unwrap();
+        let id = vectorcraft_doc::NodeId(
+            app.run("shape.rectangle", json!({"x": 10, "y": 10, "width": 20, "height": 20})).unwrap()["id"].as_u64().unwrap(),
+        );
+        app.run("select.set", json!({"ids": [id.0]})).unwrap();
+        let step = || ("object.move".to_string(), json!({"dx": 5, "dy": 0}));
+        let inner = json!({"commands": [{"command": "object.move", "params": {"dx": 5, "dy": 0}}, {"command": "example.unknown.inner"}]});
+        app.ui.action_sets = vec![ActionSet::new(
+            "Test",
+            vec![
+                Action::new("Move", vec![step(), ("example.unknown.finish".into(), json!({})), step()]),
+                Action::new("Batch", vec![step(), ("command.batch".into(), inner)]),
+            ],
+        )];
+        let x = |app: &VectorcraftApp| app.session.active().unwrap().doc.node(id).unwrap().geometric_bounds().unwrap().x0;
+        let before = x(&app);
+        for speed in [PlaybackSpeed::Accelerated, PlaybackSpeed::Step] {
+            app.ui.action_playback.speed = speed;
+            assert_eq!(play(&mut app, 0, 0).unwrap_err(), "step 2 of “Move” runs the unknown command `example.unknown.finish`");
+            assert_eq!(play(&mut app, 0, 1).unwrap_err(), "step 2.2 of “Batch” runs the unknown command `example.unknown.inner`");
+            assert_eq!(x(&app), before, "no step ran");
+            assert!(app.ui.action_playing.is_none());
+        }
+        app.ui.action_playback.speed = PlaybackSpeed::Accelerated;
+        app.ui.action_sets[0].actions[0].excluded_steps.insert(1);
+        play(&mut app, 0, 0).unwrap();
+        assert!((x(&app) - before - 10.0).abs() < 1e-9, "both included moves ran");
+    }
+
     /// Where the host can read part of a file, Load Actions… reads one byte past 8 MiB: a larger
     /// file is refused without reading all of it, and a smaller one loads.
     #[test]
@@ -5086,7 +5266,9 @@ mod tests {
     fn a_failing_step_ends_a_paced_playback_with_its_error() {
         let (mut app, x) = app_with_three_moves();
         app.run(PLAYBACK_OPTIONS, json!({"speed": "step"})).unwrap();
-        app.ui.action_sets[0].actions[0].steps[1] = ("no.such.command".into(), json!({}));
+        // A Select Object step that finds no object fails as it plays.
+        app.ui.action_sets[0].actions[0].steps[1] =
+            (SELECT_OBJECT_STEP.into(), json!({"note": "missing", "caseSensitive": false, "wholeWord": false}));
         play(&mut app, 0, 0).unwrap();
         assert_eq!(frame(&mut app, 0.0), None, "the frame after Play draws the first step");
         assert_eq!(frame(&mut app, 0.0), None);
diff --git a/crates/ui-egui/src/panels/actions/files.rs b/crates/ui-egui/src/panels/actions/files.rs
index b5805f9b2a..0d19a0bf2b 100644
--- a/crates/ui-egui/src/panels/actions/files.rs
+++ b/crates/ui-egui/src/panels/actions/files.rs
@@ -41,7 +41,8 @@ pub(super) const MAX_SET_ACTIONS: usize = 1000;
 /// The most steps [`read_set`] reads in one action.
 pub(super) const MAX_ACTION_STEPS: usize = 10_000;
 
-/// The most left-out steps that Load Actions… lists for an action set another app saved.
+/// The most left-out steps that Load Actions… lists for an action set another app saved, and the
+/// most steps with an unknown command it lists for an action set file.
 const MAX_SKIPPED: usize = 1000;
 
 /// An action set file: a header, the set's name and its actions.
@@ -488,6 +489,11 @@ fn load_aia(app: &mut VectorcraftApp, params: Value) -> Result<Value, String> {
 /// Actions… would write as a file Load Actions… refuses (larger than 8 MiB, as a file with less
 /// white space or a name that gets a number can give) is refused too, and no set is added.
 ///
+/// A step whose command is not known now ([`super::KnownCommands`]), excluded or not, and a command
+/// of a `command.batch` step that is not, still loads as it is. The answer then also lists them,
+/// and the status bar names the first and how many there are → `{…, unknownCommands: [{action,
+/// actionIndex, step, stepIndex, batchStep?, command}] (at most 1,000), unknownCount: n}`.
+///
 /// An action set another app saved as text (`.aia`, read with `actionSet.read`) comes in with its
 /// actions and the steps that stand for a VectorCraft command ([`step_name`], [`step_commands`]),
 /// with no params; a step that is off in the file is excluded from playback. A set with no name is
@@ -537,7 +543,47 @@ pub fn load_set(app: &mut VectorcraftApp, p: &Value) -> Result<Value, String> {
     set.name = free_set_name(&app.ui.action_sets, &set.name);
     // A number added to the name can make a file at the limit larger than it.
     super::edit_keeps_set_loadable(app, None, &set)?;
+    let (unknown, unknown_count, first) = unknown_commands(&set);
     let (name, actions) = (set.name.clone(), set.actions.len());
     app.ui.action_sets.push(set);
-    Ok(json!({ "set": app.ui.action_sets.len() - 1, "name": name, "actions": actions }))
+    let mut answer = json!({ "set": app.ui.action_sets.len() - 1, "name": name, "actions": actions });
+    if let Some((action, step, command)) = first {
+        app.status(crate::i18n::msg_n(
+            unknown_count as u64,
+            "Loaded “{name}”: {n} step has an unknown command and was kept: “{action}”, step {step}, `{command}`",
+            "Loaded “{name}”: {n} steps have unknown commands and were kept; the first: “{action}”, step {step}, `{command}`",
+            &[
+                ("name", &super::shown_text(&name)),
+                ("action", &super::shown_text(&action)),
+                ("step", &step),
+                ("command", &super::shown_text(&command)),
+            ],
+        ));
+        answer["unknownCommands"] = json!(unknown);
+        answer["unknownCount"] = json!(unknown_count);
+    }
+    Ok(answer)
+}
+
+/// The steps of `set` whose command is not known now ([`super::KnownCommands`]), excluded steps
+/// included: the first [`MAX_SKIPPED`] as `[{action, actionIndex, step, stepIndex, batchStep?,
+/// command}]` (`step` and `batchStep` count from 1, the indexes from 0), how many there are, and the
+/// first one's action name, place ([`super::step_place`]) and command.
+fn unknown_commands(set: &ActionSet) -> (Vec<Value>, usize, Option<(String, String, String)>) {
+    let known = super::KnownCommands::now();
+    let (mut listed, mut count, mut first) = (vec![], 0usize, None);
+    for (a, action) in set.actions.iter().enumerate() {
+        for (step, in_batch, command) in action.unknown_commands(&known, false) {
+            count += 1;
+            first.get_or_insert_with(|| (action.name.clone(), super::step_place(step, in_batch), command.to_string()));
+            if listed.len() < MAX_SKIPPED {
+                let mut entry = json!({ "action": action.name, "actionIndex": a, "step": step + 1, "stepIndex": step, "command": command });
+                if let Some(j) = in_batch {
+                    entry["batchStep"] = json!(j + 1);
+                }
+                listed.push(entry);
+            }
+        }
+    }
+    (listed, count, first)
 }
diff --git a/docs/mcp.md b/docs/mcp.md
index f0eaf09aae..0cbb30e0b6 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -3299,7 +3299,13 @@ already walks Image Trace. Short agent entry points:
   action and preference. An empty folder and the scratch disk choices `Startup` and `None` save. `ui.actionSet.load {path? | data?}` reads
   the file at `path`, else a picked one, or the file's text `data`, adds its set after the other sets and returns
   `{set, name, actions}`. A set named like one already in the panel gets the next free number (`Print 2`), and the
-  other sets and the current set stay as they are. An action set file (`.vcactions`) is JSON:
+  other sets and the current set stay as they are. A step whose command is not a built-in command, a command of an
+  installed plug-in, a View menu step or a stop, and such a command of a `command.batch` step, loads as it is, excluded
+  or not, and `ui.actionSet.save` writes it back. The answer then also has `unknownCommands: [{action, actionIndex, step,
+  stepIndex, batchStep?, command}]`, the first 1,000 such steps (`step` and `batchStep` count from 1, `actionIndex` and
+  `stepIndex` from 0, and `batchStep` is the command's place in a `command.batch` step), and `unknownCount`, how many
+  there are; the status bar names the first and the count, with control characters replaced and long names cut at 80
+  characters. These are VectorCraft's own rules. An action set file (`.vcactions`) is JSON:
   `{"format": "vcactions", "version": 1 to 6, "name", "actions": [{"name", "steps": [{"command", "params", "excluded"?}]}]}`, each step
   a command id and its params as `command.batch` takes them, or a stop: the command `action.stop` with
   `{message, allowContinue}`. A Select Object step is the command `select.byNote` with `{note, caseSensitive,
@@ -3379,8 +3385,12 @@ already walks Image Trace. Short agent entry points:
   made active, or that document was closed), the playback ends with a status and the rest do not play; a step that
   makes another document active itself does not end it. A name that no
   action has, or that more than one action in the sets looked in has, or whose every step is excluded, is an error, and
-  then nothing plays. So is an action played while another is still playing at Step by Step or Pause For. A
-  `command.batch` step, which an action played or a panel operation run as one batch records, plays as its own steps,
+  then nothing plays. So is an action played while another is still playing at Step by Step or Pause For. So is an
+  action with an included step whose command is not a built-in command, a command of an installed plug-in, a View menu
+  step or a stop at the time it plays, at every speed: the error names the first such step, as in step 2 of “Print”
+  runs the unknown command `example.finish`, and a command of a `command.batch` step by its place in the batch, as in
+  step 2.3. An excluded step is not checked.
+  A `command.batch` step, which an action played or a panel operation run as one batch records, plays as its own steps,
   here and in Batch…. An action with an included stop plays up to the stop at any speed and then waits, with its
   message box open, until `ui.action.continue` or `ui.action.stop`. At Accelerated the steps between two stops are one
   undoable batch each. The result is then `{results, pending, atStop?}`, with `atStop: true` when the action already
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index e588f9611c..08ce46cebf 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -772,6 +772,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   - Batch…: Override Save and Override Export name each file with the extension of the format the step writes, however the step spells the format (`.svg` and `SVG` give `.svg`, `png8` gives `.png`), in `action.batch`.
   - Batch…: Override Export writes the files of an Export for Screens or Export Assets step into a folder for each source file or data set inside the destination folder, under the names the export gives them (`action.batch`). The folder and file names drop trailing periods and spaces (`a..svg` gives `a`). When two source files would get the same name that way (compared without case), or a later file's folder or file would take the name of an output an earlier file wrote, of a source file in the destination folder or, for data sets, of a file already there, Batch adds `-2`, `-3`… to the later one's name.
   - Actions panel menu: Save Actions… writes the current action set with all its actions to a file, and Load Actions… adds the set from such a file to the panel ([Manage a set of actions](https://helpx.adobe.com/illustrator/desktop/automate-visualize-data/automate-actions/manage-a-set-of-actions.html); `ui.actionSet.save`, `ui.actionSet.load`). The file is VectorCraft's own action set file (`.vcactions`); a loaded set named like one in the panel gets the next free number.
+  - Actions panel menu: Load Actions… keeps a step whose command this build or its installed plug-ins do not have, and reports each one when the set loads: the `ui.actionSet.load` answer lists the action, step and command id (`unknownCommands`, `unknownCount`), and the status bar names the first and the count. An action with such a step included does not play, and the error names the step and its id before any step runs; an excluded one does not stop it. These are VectorCraft's own rules. Tests `panels::actions::tests::{load_actions_reports_steps_with_unknown_commands, load_actions_bounds_what_it_reports_of_unknown_commands, an_action_with_an_unknown_command_does_not_play}`.
   - Actions panel menu: Save Actions… does not write a set with a step that sets a folder preference (the Fonts, Plug-ins, Templates and Recovery folders and the two scratch disks) to a folder, and names the action and the preference instead; an empty folder and the scratch disk choices Startup and None save. Export Preferences leaves out both scratch disks, and `ui.inspect` under automation read roots leaves such a folder outside them out of recorded steps. These are VectorCraft's own rules (`ui.actionSet.save`, `prefs.export`).
   - Actions panel menu: Load Actions… also reads action sets saved as `.aia` files ([Actions panel overview](https://helpx.adobe.com/illustrator/desktop/automate-visualize-data/automate-actions/actions-panel-overview.html); `actionSet.read`, `ui.actionSet.load`). VectorCraft's own rules: the set comes in with all its actions. A step with a label and no recorded values comes in as the one menu command with the step's label, when that command is directly in a top menu, is what its menu bar item runs with no values and opens no dialog. A step that is off in the file stays excluded from playback. The other steps, recorded menu items included, are left out, and the status bar says how many.
   - Actions panel: the panel menu's Action Options… renames the selected action and keeps its steps ([Actions panel overview](https://helpx.adobe.com/illustrator/desktop/automate-visualize-data/automate-actions/actions-panel-overview.html): the menu item opens a dialog that renames the action or gives it a function key and color; `ui.action.options`). It also sets the action's function key and color.