A quiz where the teacher has set a time limit, no close date and "When time expires" to "that is it. The attempt must be submitted before time expires, or it is not counted".
1. As student, start a quiz attempt and answer some questions but not all, then log out of Moodle.
2. Wait until time limit has expired. CRON has not been run yet.
3. CRON runs!
4. Log in as teacher, and you should be able to see that the attempt has been updated to "Never submitted" and is no longer "In progress".
5. Log in as student, and you should see that the attempt is "Never submitted".