Ticket #55257: #55257.patch

formatting.php

@@ -5000 +5000 @@
  * @return mixed The value with the callback applied to all non-arrays and non-objects inside it.
  */
 function map_deep( $value, $callback ) {
+        if ( is_object( $value ) && $value instanceof __PHP_Incomplete_Class ) {
+                 return $value;
+                }
+
         if ( is_array( $value ) ) {
                 foreach ( $value as $index => $item ) {
                         $value[ $index ] = map_deep( $item, $callback );