Ticket #39215: 39215.2.patch

src/wp-includes/taxonomy.php

@@ -1877 +1877 @@
                 $object_ids = array($object_ids);
         $object_ids = array_map('intval', $object_ids);
 
+        if ( is_string( $args ) ) {
+                $args = wp_parse_args( $args );
+        }
+
         $args['taxonomy'] = $taxonomies;
         $args['object_ids'] = $object_ids;