I have to admit, I have a loose understanding of what's going on with twitter or even how to use it. But my personal Mandela effect is that it didn't work right if you weren't logged in for a lot longer than that.

I'm probably mis-remembering.

You used to be able to look at people's profiles, tweets and entire threads without being signed in. If you go to my profile today signed out you see tweets from before 2022. If you click on a tweet signed out, you only see that single tweet without context. Some of those changes are only a few months back.