Ticket #24767: 24767.4.diff

src/wp-content/themes/twentytwelve/js/navigation.js

@@ -42 +42 @@
         } );
 
   if ( 'ontouchstart' in window ) {
-    $( '.menu-item-has-children > a' ).on( 'touchstart.twentytwelve', function( e ) {
+    $('body').on( 'touchstart.twentytwelve',  '.menu-item-has-children > a, .page_item_has_children > a', function( e ) {
       var el = $( this ).parent( 'li' );
 
       if ( ! el.hasClass( 'focus' ) ) {