diff --git a/crates/eps/src/ai_editing.rs b/crates/eps/src/ai_editing.rs
index 552a99fe0..d87a00396 100644
--- a/crates/eps/src/ai_editing.rs
+++ b/crates/eps/src/ai_editing.rs
@@ -156,26 +156,35 @@ fn crlf(s: &str) -> Vec<u8> {
     s.replace('\n', "\r\n").into_bytes()
 }
 
-/// `doc` with its geometry effects baked ([`vectorcraft_effects::bake_document`]), in its symbols'
-/// art too (which instances are written as); `None` when nothing changes.
+/// `doc` with its geometry effects and group paint baked ([`vectorcraft_effects::bake_document`]),
+/// in its symbols' art and its patterns' tile art too (which instances and pattern fills are
+/// written as); `None` when nothing changes.
 fn baked(doc: &Document) -> Option<Document> {
     let baked = vectorcraft_effects::bake_document(doc);
     let d = baked.as_ref().unwrap_or(doc);
-    if !d.symbols.iter().any(|s| vectorcraft_effects::needs_bake(&s.art)) {
+    let needs = vectorcraft_effects::needs_bake;
+    if !d.symbols.iter().any(|s| needs(&s.art)) && !d.patterns.iter().any(|p| p.art.iter().any(|a| needs(a))) {
         return baked;
     }
-    // The symbols' art baked as the layers of a copy of the document.
+    // The symbols' art, then each pattern's art, baked as the layers of a copy of the document.
     let mut art = d.clone();
-    art.layers = d.symbols.iter().map(|s| Arc::new(Node::group(s.art.id, vec![s.art.clone()]))).collect();
+    let symbols = d.symbols.iter().map(|s| Arc::new(Node::group(s.art.id, vec![s.art.clone()])));
+    let patterns = d.patterns.iter().map(|p| Arc::new(Node::group(vectorcraft_doc::NodeId(0), p.art.clone())));
+    art.layers = symbols.chain(patterns).collect();
     // The copy keeps what baking adds to the document (the images color adjustments make).
     let Some(mut out) = vectorcraft_effects::bake_document(&art) else { return baked };
-    let arts: Vec<Option<Arc<Node>>> = out.layers.iter().map(|l| l.children().and_then(|c| c.first()).cloned()).collect();
-    out.layers = d.layers.clone();
-    for (s, a) in out.symbols.iter_mut().zip(arts) {
-        if let Some(a) = a {
+    let layers = std::mem::replace(&mut out.layers, d.layers.clone());
+    let mut members = layers.iter().map(|l| l.children().cloned().unwrap_or_default());
+    for s in out.symbols.iter_mut() {
+        if let Some(a) = members.next().and_then(|m| m.first().cloned()) {
             s.art = a;
         }
     }
+    for p in out.patterns.iter_mut() {
+        if let Some(m) = members.next() {
+            p.art = m;
+        }
+    }
     Some(out)
 }
 
diff --git a/crates/eps/src/ai_editing/tests.rs b/crates/eps/src/ai_editing/tests.rs
index e7f9c9d39..696014fb9 100644
--- a/crates/eps/src/ai_editing/tests.rs
+++ b/crates/eps/src/ai_editing/tests.rs
@@ -718,6 +718,27 @@ fn an_adjusted_image_in_a_symbol_is_written_in_its_adjusted_color() {
     assert_ne!(fill, paint(&solid(Color::rgb(0.0, 0.0, 0.0))), "the image is adjusted");
 }
 
+#[test]
+fn a_group_fill_in_a_pattern_tile_is_written() {
+    let mut doc = Document::new(200.0, 100.0);
+    let layer = doc.layers[0].id;
+    let dot = Node::path(doc.alloc_id(), shapes::rectangle(Rect::new(0.0, 0.0, 10.0, 10.0)), Appearance::default());
+    let mut group = Node::group(doc.alloc_id(), vec![Arc::new(dot)]);
+    group.appearance = Appearance::basic(solid(Color::rgb(1.0, 0.0, 0.0)), Paint::None, 0.0).into();
+    doc.patterns.push(vectorcraft_doc::PatternDef::new("Dots", vec![Arc::new(group)]));
+    let filled = Node::path(
+        doc.alloc_id(),
+        shapes::rectangle(Rect::new(20.0, 20.0, 40.0, 40.0)),
+        Appearance::basic(Paint::Pattern { pattern: "Dots".into(), xf: Affine::IDENTITY }, Paint::None, 0.0),
+    );
+    doc.insert(Some(layer), usize::MAX, filled).unwrap();
+    let back = read_back(&doc);
+    let mut all = vec![];
+    paths(back.layers[0].children().unwrap(), &mut all);
+    let red = paint(&solid(Color::rgb(1.0, 0.0, 0.0)));
+    assert!(all.iter().any(|p| p.appearance.items.iter().any(|i| paint(i.paint()) == red)), "the tiles keep their group's fill");
+}
+
 #[test]
 fn effects_on_a_fill_are_reported_left_out() {
     let mut doc = Document::new(200.0, 100.0);