Ticket #40803: 40803.2.diff

wp-admin/js/widgets/media-widgets.js

@@ -249 +249 @@
                  */
                 createStates: function createStates() {
                         var mime = this.options.mimeType, specificMimes = [];
+
                         _.each( wp.media.view.settings.embedMimes, function( embedMime ) {
                                 if ( 0 === embedMime.indexOf( mime ) ) {
                                         specificMimes.push( embedMime );
                                 }
                         });
-                        if ( specificMimes.length > 0 ) {
-                                mime = specificMimes.join( ',' );
+
+                        if ( specificMimes.length ) {
+                                mime = specificMimes;
                         }
 
                         this.states.add([