Steps to reproduce:

1. Setup a quiz with a small "Time limit", "When time expires" set to "There is a grace period when open attempts can be submitted, but no more questions answered" and a long "Submission grace period".
2. Access the app with a student and start a new quiz attempt.
3. Answers some questions but don't submit the attempt, let the time limit run out.
4. Once the attempt is overdue, click "Submit all and finish"
5. An modal error is shown with text "Overdue" and the attempt is not submitted.

The error is returned by the web service function "mod_quiz_process_attempt". Maybe we should pass the parameter "timeup" set to 1 in this case, althought the documentation says it is only for timers.