Ticket #16895: 16895.2.patch

wp-includes/functions.php

@@ -3094 +3094 @@
 function wp_list_pluck( $list, $field ) {
         foreach ( $list as $key => $value ) {
                 $value = (array) $value;
+                unset( $list[ $key ] ); # remove possible references
                 $list[ $key ] = $value[ $field ];
         }