Guys, is there any way to prevent the reading lists from disappearing if that happens agai...

I suggest making 'my list' for your want to/reading/read. If it pasts 200, just make another list: 'reading list pt. 2' or sumn like that. If u still want to just mark it as want to/reading/read, always add tag and or rating. Safest option would be to make external list on spreadsheet or online trackers ig