This is a complaint and not a bug (to clarify since this area is
for both), but I think it's a pretty reasonable complaint. In the
Advent Calendar it counts how many doors you've opened. Missing a
day shouldn't have you be told you've opened a door already. "You
missed this day" or something makes much more sense and doesn't
contradict the count. I did the task but forgot to claim the prize
for the 15th, and when I check it, it tells me the door is opened.
But that's not what actually happened. What happened is I forgot to
claim the prize. I missed the day. Saying it's open contradicts it
telling me the number of doors open.
Just remember: You can't prove God didn't crawl out of the ocean.