Apple Reminders is a bit buggy. If you have a ton of reminders like I do, it can start exhibiting some strange behavior.
If you see a reminder that’s missing a description, BE CAREFUL. There’s a possibility that what you’re seeing is not what’s truly there – and in that case, any recent modifications you made to tasks (edits/deletions/marked completions) might have modified the wrong tasks. If you just deleted any tasks, you should hit the undo button to un-delete any tasks that you just deleted. After undoing any deletions, quit Reminders, and reopen it. Hopefully, at that point, things will be correct and you’ll be able to proceed as normal. (If you quit reminders after deleting tasks, there’s no way to get the tasks back unless you have a Time Machine backup, and even then I’m not sure how to get those reminders back. It would be a big hassle).
I have at least 60 repeating reminders each day, and if I don’t delete them, I could end up with over a thousand completed reminders within a few weeks. Because of that, I delete them. But when you delete reminders in bulk, the UI doesn’t update properly. For example, if you delete reminders in bulk and then try to add/edit/delete something else, you might be editing or deleting a reminder that’s different from the one you’re seeing – the display got jumbled up compared to what’s really there. After bulk-deleting completed reminders, always quit Apple Reminders and then re-open it.
Repeating reminders skip missed occurrences. If you made a reminder that repeats every Saturday, and then on the Sunday following the next Saturday you mark the reminder as complete, the reminder will jump to the next Saturday from the current day, not to the Saturday that just passed. Here’s an illustration:
Saturday: Original due date
Sunday: Today you mark it as complete
Saturday: New due date
Be careful before and after changing 1+ reminders’ due date when dragging them to the calendar on the bottom left of the reminders window. It’s best to restart reminders right before and after performing that action, because otherwise, reminders could end up in an inconsistent state (like described above with reminders missing descriptions, and the reminders displaying a different reminder than the one that’s actually there).
Reminders can’t handle the “file:///” URI. If you try to link to a file using the file:/// uri, Finder will probably crash instantly.
Maybe more tips to come…