Remove questions from parent multi-variant sets

administrator/components/com_testquestions/src/Model/SetModel.php

@@ -137,6 +137,10 @@ class SetModel extends AdminModel
             $data['set_type'] = 'ordinary';
         }
 
+        if ($parentId === 0 && ($data['set_type'] ?? 'ordinary') === 'multi') {
+            $questionIds = [];
+        }
+
         if (!parent::save($data)) {
             return false;
         }