Ticket #44394: patch.diff

wp-includes/js/media-editor.js

@@ -584 +584 @@
                         _.each( this.defaults, function( value, key ) {
                                 attrs[ key ] = self.coerce( attrs, key );
                                 if ( value === attrs[ key ] && ( ! changed || value === wp.media._galleryDefaults[ key ] ) ) {
+                                        if ( 'columns' === key ) {
+                                                return;
+                                        }
                                         delete attrs[ key ];
                                 }
                         } );