Ticket #13379: 13379.2.diff

wp-includes/nav-menu-template.php

@@ -75 +75 @@
                 if ( 'custom' != $item->type ) {
                         $classes[] = 'menu-item-object-' . $item->object;
                         $classes[] = 'menu-item-object-' . $item->type . '-' . $item->object_id;
+                        if ( 'post_type' == $item->type && 'page' == $item->object ) {
+                                // Back compat classes
+                                $classes[] = 'page_item';
+                                $classes[] = 'page-item-' . $item->object_id;
+                        }
                 }
 
                 $classes = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) );