Index: src/wp-includes/js/admin-bar.js
===================================================================
--- src/wp-includes/js/admin-bar.js	(revision 32819)
+++ src/wp-includes/js/admin-bar.js	(working copy)
@@ -28,6 +28,12 @@
 					e.stopPropagation();
 					e.preventDefault();
 					el.addClass('hover');
+				} else if ( ! $( e.target ).closest( 'div' ).hasClass( 'ab-sub-wrapper' ) ) {
+					// We're dealing with an already-touch-opened menu genericon (we know el.hasClass('hover')),
+					// so close it and prevent propag and defaults. See #29906
+					e.stopPropagation();
+					e.preventDefault();
+					el.removeClass('hover');
 				}
 
 				if ( unbind ) {