Index: wp-includes/js/media-models.js
===================================================================
--- wp-includes/js/media-models.js	(revision 22120)
+++ wp-includes/js/media-models.js	(working copy)
@@ -459,7 +459,7 @@
 			// are no filters for other properties, so observing will result in
 			// false positives in those queries.
 			allowed = [ 's', 'order', 'orderby', 'posts_per_page', 'post_mime_type' ];
-			if ( _( this.args ).chain().keys().difference().isEmpty().value() )
+			if ( _( this.args ).chain().keys().difference(allowed).isEmpty().value() )
 				this.observe( Attachments.all );
 		},