Can you test this? (You need a spare login which you can use, to log in and see thing from the student's point of view.) I think this works. It certainly does on https://qa.moodledemo.net/
Quiz
User Override Not Working Properly (Moodle 3.9)
Гэтае абмеркаваньне было заблакавана, таму вы болей ня можаце адказваць на яго.