diff -r 0cb504a34f2c wp-includes/query.php
--- a/wp-includes/query.php     Thu Dec 03 14:15:40 2015 -0500
+++ b/wp-includes/query.php     Thu Dec 03 14:16:05 2015 -0500
@@ -2372,7 +2372,7 @@
                                if ( !$ptype_obj || !$ptype_obj->query_var || empty($q[ $ptype_obj->query_var ]) )
                                        continue;

-                               if ( ! $ptype_obj->hierarchical || strpos($q[ $ptype_obj->query_var ], '/') === false ) {
+                               if ( ! $ptype_obj->hierarchical ) {
                                        // Non-hierarchical post_types & parent-level-hierarchical post_types can directly use 'name'
                                        $q['name'] = $q[ $ptype_obj->query_var ];
                                } else {