Ticket #53599: 53599.patch

wp-includes/class-wp-theme.php

@@ -1196 +1196 @@
                 $files = (array) self::scandir( $this->get_stylesheet_directory(), $type, $depth );
 
                 if ( $search_parent && $this->parent() ) {
-                        $files += (array) self::scandir( $this->get_template_directory(), $type, $depth );
+                        $parent_files = self::scandir( $this->get_template_directory(), $type, $depth );
+                        if ( ! empty( $parent_files ) ) {
+                                $files += (array) $parent_files;
+                        }
                 }
 
                 return $files;