I think this is a critical bug (or I haven't undestand it yet).

To reproduce:

• Create a course C_original
• Create a course C_target
• Create a quiz (Q) in C_original
• Add a question to Q (i've tested with multiple choice).
• Within course C_target import C_original with activities and content bank.
• Within course C_original visit the quiz and create a backup of it with activities and question bank.
• Once created, restore it into C_target
• Go to C_target
• Visit the quiz in C_target
• Click on Questions
• Edit the only question that you added previouly
• Change whatever you want in the question (i recommend the title).
• Save changes.
• Now go to the quiz in C_original
• Click on questions

What you get is that the title that you've just edited in the target course is updated in the original course.

What I expected is that the title changes in C_target but not in C_original.

It seems to me that questions within the quiz in target course are not in the target course but in the original one.

If this is the expected behaviour, please let me now.

I haven't tested on 4.2 yet, but they might be affected too.