I had a course working fine in M34.
I made a backup of this course and I restored it in a just installed instance of M36.
All is fine in M36 but not the last quiz.
The backup I made is available here: << link removed >>

The issue appears when I try to test "Quiz finale" (it is in the last section of the course) and I push the "Attempt quiz now" button. The error I get is: Coding error detected, it must be fixed by a programmer: Category id=4 is already on the list - loop of categories detected.