QTI 2.1 Question bank does not update preview immediately

a question is created in the question bank, e.g. SC with one answer --> have a look in preview and I see question with one answer.

A second answer is added and after save I go directly to preview
--> only one answer is visible
after refresh, second answer is visible as well

--> preview should show immediately all changes I did in edition mode, which means e.g. all answers added