The trouble with a problem like this is that it is almost impossible to reproduce.
I suppose what I would need a someone who:
1. Experienced this problem; and
2. Took a backup of their database before doing the upgrade; and
3. Could send me a copy of that database backup, (and details of exactly which version of Moodle they were running before the upgrade), without breaking the data-protection laws in thier country, or thier students expectations of privacy.
Then I might be able to reproduce the bug, then I might be able to fix it.
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