Ticket #20786: 20786.diff

wp-admin/upload.php

@@ -69 +69 @@
                                         continue;
 
                                 $attach[] = $att_id;
-                                clean_attachment_cache( $att_id );
                         }
 
                         if ( ! empty( $attach ) ) {
-                                $attach = implode( ',', $attach );
-                                $attached = $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->posts SET post_parent = %d WHERE post_type = 'attachment' AND ID IN ( $attach )", $parent_id ) );
+                                $attach_string = implode( ',', $attach );
+                                $attached = $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->posts SET post_parent = %d WHERE post_type = 'attachment' AND ID IN ( $attach_string )", $parent_id ) );
+                                foreach ( $attach as $att_id ) {
+                                        clean_attachment_cache( $att_id );
+                                }
                         }
 
                         if ( isset( $attached ) ) {