WordPress Version: 5.6
/**
* Callback for handling a menu item when its original object is deleted.
*
* @since 3.0.0
* @access private
*
* @param int $object_id The ID of the original object being trashed.
*/
function _wp_delete_post_menu_item($object_id)
{
$object_id = (int) $object_id;
$menu_item_ids = wp_get_associated_nav_menu_items($object_id, 'post_type');
foreach ((array) $menu_item_ids as $menu_item_id) {
wp_delete_post($menu_item_id, true);
}
}