Sort direction is ignored when displaying custom post types

--- wp-sitemap-page.php.orig	2020-07-13 11:48:56.611539910 +0200
+++ wp-sitemap-page.php	2020-07-13 11:50:42.255291217 +0200
@@ -527,7 +527,7 @@
 			$cpt = get_post_type_object( $only_cpt );
 			
 			if ( !empty($cpt) ) {
-				return wsp_return_content_type_cpt_items( $is_title_displayed, $display_nofollow, $cpt, $only_cpt, $wsp_exclude_pages, $sort );
+				return wsp_return_content_type_cpt_items( $is_title_displayed, $display_nofollow, $cpt, $only_cpt, $wsp_exclude_pages, $sort, $order );
 			}
 			
 			// check if it's a taxonomy
@@ -919,9 +919,10 @@
  * @param str $post_type
  * @param str $wsp_exclude_pages
  * @param str $sort
+ * @param str $order
  * @return str $return
  */
-function wsp_return_content_type_cpt_items( $is_title_displayed=true, $display_nofollow=false, $cpt, $post_type, $wsp_exclude_pages, $sort=null ) {
+function wsp_return_content_type_cpt_items( $is_title_displayed=true, $display_nofollow=false, $cpt, $post_type, $wsp_exclude_pages, $sort=null, $order=null ) {
 	
 	// init
 	$return = '';
@@ -940,10 +941,14 @@
 		$args['exclude'] = $wsp_exclude_pages;
 	}
 	
-	// change the sort order
+	// change the sort field
 	if ($sort!==null) {
 		$args['orderby'] = $sort;
 	}
+	// change the sort order
+	if ($order!==null) {
+		$args['order'] = $order;
+	}
 	
 	// Query to get the current custom post type
 	$posts_cpt = get_posts( $args );