Ticket #26631: 26631.12.diff

src/wp-includes/js/media-editor.js

@@ -396 +396 @@
 
                         if ( -1 !== jQuery.inArray( prop, ['playlist', 'video-playlist'] ) ) {
                                 _.each(['tracknumbers', 'tracklist', 'images', 'artists'], function (setting) {
+                                        if ( 'undefined' === typeof attrs[ '_' + setting ] ) {
+                                                attrs[ '_' + setting ] = wp.media[ prop ].defaults[ setting ];
+                                        }
+
                                         if ( attrs['_' + setting] ) {
                                                 attrs[setting] = true;
                                         } else {