Here's another one:
Questions where the bot asks for a year don't work anymore. They used to, but that stopped some time ago. Maybe a couple months ago, I'm not sure when, but somewhere second half of last year.
For example if the ansver 1960, people could spam the chat with every number between 1940-1990, but nobody else, including the bot, would be able to see any of those numbers. Only the person who says them would see what they say and nobody is able to give an ansver to the question, that is accepted.
I'm pretty sure this only happens with questions that need a four digit number for the ansver. Two digit ones do work, three digit ones are rare enough, that I can't tell and five digit ones are so rare that I don't remember seeing any ever.
Oddly some people are able to ansver the questions. I can do that sometimes, but usually it does not work.
Unlike my earlier complaint, which You disregarded because the occasions were rare, this happens a lot. Because there are many, many "name the year" questions on the list and most of them don't work, at least for most people.