Ticket #24345: 24345.2.diff

src/wp-includes/link-template.php

@@ -1182 +1182 @@
                         $preview_link = get_permalink( $post );
                 }
 
-                $query_args['preview'] = true;
+                $query_args['preview'] = 'true';
                 $preview_link = add_query_arg( $query_args, $preview_link );
         }