Fix block styles missing in pattern creator editor canvas

public_html/wp-content/plugins/pattern-creator/pattern-creator.php

@@ -200,6 +200,33 @@ function inject_editor_template( $template ) {
 }
 add_filter( 'template_include', __NAMESPACE__ . '\inject_editor_template' );
 
+/**
+ * Enqueue block frontend styles for the editor canvas.
+ *
+ * _wp_get_iframed_editor_assets() fires enqueue_block_assets with an isolated WP_Styles
+ * instance, then captures its output into __unstableResolvedAssets. It enqueues
+ * editor_style_handles but not style_handles, so block frontend styles (style.min.css)
+ * are absent from the canvas — breaking blocks like Cover that need them for layout/background.
+ *
+ * Mirroring the fix proposed for WordPress core (_wp_get_iframed_editor_assets should loop
+ * over style_handles too), we enqueue them here so they are captured in the same window.
+ */
+function enqueue_block_frontend_styles_for_canvas() {
+	if ( ! should_load_creator() ) {
+		return;
+	}
+
+	$block_registry = \WP_Block_Type_Registry::get_instance();
+	foreach ( $block_registry->get_all_registered() as $block_type ) {
+		if ( isset( $block_type->style_handles ) && is_array( $block_type->style_handles ) ) {
+			foreach ( $block_type->style_handles as $style_handle ) {
+				wp_enqueue_style( $style_handle );
+			}
+		}
+	}
+}
+add_action( 'enqueue_block_assets', __NAMESPACE__ . '\enqueue_block_frontend_styles_for_canvas' );
+
 /**
  * Add a rewrite rule to handle editing a pattern.
  */

public_html/wp-content/plugins/pattern-creator/src/components/block-editor/index.js

@@ -65,13 +65,8 @@ export default function BlockEditor( { setIsInserterOpen } ) {
 				<div className="pattern-visual-editor__post-title-wrapper">
 					<PostTitle />
 				</div>
-				<Iframe
-					style={ resizedCanvasStyles }
-					head={ <EditorStyles styles={ settings.styles } /> }
-					ref={ ref }
-					contentRef={ mergedRefs }
-					name="editor-canvas"
-				>
+				<Iframe style={ resizedCanvasStyles } ref={ ref } contentRef={ mergedRefs } name="editor-canvas">
+					<EditorStyles styles={ settings.styles } />
 					<LayoutStyle
 						selector=".pattern-block-editor__block-list.is-root-container"
 						layout={ { ...layout, type: 'constrained' } }