Fix incorrect block editing mode assigned in some cases

talldan · talldan · commit baaa9bca40ac · 2025-09-30T17:38:54.000+08:00
diff --git a/packages/block-editor/src/store/reducer.js b/packages/block-editor/src/store/reducer.js
@@ -2307,12 +2307,7 @@ function getDerivedBlockEditingModesForTree(
 			let ancestorBlockEditingMode;
 			let parent = state.blocks.parents.get( clientId );
 			while ( parent !== undefined ) {
-				// There's a chance we only just calculated this for the parent,
-				// if so we can return that value for a faster lookup.
-				if ( derivedBlockEditingModes.has( parent ) ) {
-					ancestorBlockEditingMode =
-						derivedBlockEditingModes.get( parent );
-				} else if ( state.blockEditingModes.has( parent ) ) {
+				if ( state.blockEditingModes.has( parent ) ) {
 					// Checking the explicit block editing mode will be slower,
 					// as the block editing mode is more likely to be set on a
 					// distant ancestor.
