Steps to reproduce:

1. Create a quiz using Immediate feedback, with the option to 'Try another question like this one' enabled.
2. Add a true-false question to the quiz (exact type does not matter).
3. Attempt the quiz as a student. Redo the question at least one.
4. As teacher, log in and edit the question.
5. Go to the quiz -> grades report.
6. Click 'Regrade all attempts'

Expected result: the attempt is regraded.

Actual result: Missing record exception. See https://moodle.org/mod/forum/discuss.php?d=443746.