@markusfluer : it's a temporary system or the random number is here definitively ?

I like that. I changed the default title generation to G{group_order}Q{question_order}
The question needs a title to be internally rendered.
That's why there is something like a default title now, also in my opinion it is more logical to have default codes on as well subquestions answers and questions.

Fixed in Release 4.0.0-RC4+190930