I have this event, but it's not working like usual. What has changed? I play a previously played game and it's not collecting. I'm on level 17875 so if you have to only collect on unplayed levels I might as well forget trying.
It is actually worse than you think. The first few new levels get a huge difficulty boost when the event is active, I used to only play it with new levels, making it an event that actually wastes your time.