diff --git a/crates/engine/src/cmd/buildcmds/live_paint.rs b/crates/engine/src/cmd/buildcmds/live_paint.rs
index 073b0f8bd5..b049f59f0c 100644
--- a/crates/engine/src/cmd/buildcmds/live_paint.rs
+++ b/crates/engine/src/cmd/buildcmds/live_paint.rs
@@ -331,8 +331,9 @@ fn lp_segments(pd: &PathData) -> Vec<kurbo::CubicBez> {
 /// face that shares with a face already reached an edge that is hidden or draws no stroke
 /// ([`unstroked`]). Hidden faces are not reached and do not pass the flood on. A face runs along an
 /// edge segment over the part of it between the points nearest the ends of one of the face's
-/// outline segments, when that part lies within [`LP_JOIN_TOL`] of the outline segment; one outline
-/// segment can run along several edge segments. Two faces share the edge where those parts overlap
+/// outline segments, when that part's points at a quarter, half and three quarters of its
+/// parameter range lie within [`LP_JOIN_TOL`] of the outline segment; one outline segment can run
+/// along several edge segments. Two faces share the edge where those parts overlap
 /// along more than [`LP_JOIN_TOL`], so two faces that a Gap Detection gap parts on the same side of
 /// an edge, whose parts only touch, do not.
 fn flood_faces(group: &Node, start: NodeId) -> Vec<NodeId> {
diff --git a/crates/tools/src/builder/tests.rs b/crates/tools/src/builder/tests.rs
index 80a2dbd7a4..1e22c67b26 100644
--- a/crates/tools/src/builder/tests.rs
+++ b/crates/tools/src/builder/tests.rs
@@ -1178,6 +1178,15 @@ fn bucket_triple_click_on_a_made_group_skips_open_paths() {
     let mut look = Appearance::default_art();
     look.set_fill(blue);
     d.insert(Some(l), 1, Node::path(front, PathData::single(SubPath::polyline(&u, false)), look)).unwrap();
+    // The face the planar map makes there takes its fill from the square, as the group's would.
+    let shapes: Vec<vectorcraft_pathops::Shape> = [back, front]
+        .iter()
+        .enumerate()
+        .filter_map(|(k, id)| node_outline(d.node(*id)?).map(|(path, rule)| vectorcraft_pathops::Shape::new(path, rule, k as u64)))
+        .collect();
+    let (regions, _) = vectorcraft_pathops::live_paint(&shapes);
+    let face = regions.iter().find(|r| r.contains(Point::new(75.0, 25.0))).expect("a face at (75, 25)");
+    assert_eq!(face.top(), Some(0), "the square is the face's top shape");
     let mut s = Selection::default();
     s.set([back, front]);
     let p = paint();