Index: src/wp-includes/formatting.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/wp-includes/formatting.php	(revision 35904)
+++ src/wp-includes/formatting.php	(revision )
@@ -3881,8 +3881,8 @@
  */
 function map_deep( $value, $callback ) {
 	if ( is_array( $value ) || is_object( $value ) ) {
-		foreach ( $value as &$item ) {
-			$item = map_deep( $item, $callback );
+		foreach ( $value as $index => $item ) {
+			$value[$index] = map_deep( $item, $callback );
 		}
 		return $value;
 	} else {