Hello, seen this a couple times in the forums but my situation is a bit different. Using Thunderbird 128.7.0esr on Windows 10 and I get the attached message occasionally when dismissing or snoozing a calendar reminder, sometimes multiple ones at once. It appears to be random and happens with different events. Only unique thing with me is this calendar is not synced or tied with an email address, it is solely local to my PC and it is managed, edited and added to almost weekly. I do have it backed up but don't want to mess with any settings until guidance is provided, I rely on this very heavily.

Any suggestions are appreciated, thanks in advance.