wp_nav_menu doesn’t generate parent/ancestor classes
This is part of code in _wp_menu_item_classes_by_context() that handles current class for pages: // if the menu item corresponds to the currently-queried post or taxonomy object } elseif ( $menu_item->object_id == $queried_object_id && ( ( ! empty( $home_page_id ) && ‘post_type’ == $menu_item->type && $wp_query->is_home && $home_page_id == $menu_item->object_id ) || ( ‘post_type’ == $menu_item->type … Read more