by Rebecca Trynes.
I have found something very similar happened in my upgraded instance of Moodle. I went from 3.1.5 to 3.3.2 and now a bunch of courses from 2 years ago are getting backed up due to a calendar event being added on an assignment that hasn't seen activity since 2015!
These calendar events were added just yesterday via the course report log.
Was there some code added to Moodle core that would have caused this new event to pop up in old courses? Maybe a new database column in the event table??? Or simply a new event for assignments that automatically add an event to the calendar? i might have to look back through the change log to see if I can work it out.
More importantly: when will it stop!
If anyone knows anything, I'd love to hear it.