This problem started affecting me a week ago or so. It’s been driving me up the wall!
It only seems to affect tech giant sites: Facebook, Twitter, YouTube, LinkedIn. On many smaller websites, my login sessions continue to work after those big sites are struck by another wave of amnesia, which has happened to me at least four times today.
All the tech giants appear to use device-based login sessions that Safari 15 intermittently breaks. In Twitter’s session management tool, I can see a litany of “devices” but they are all the same MacBook Pro I am typing on now.
Opening the Web Inspector seems to cause it, but not immediately. An indeterminate amount of time must elapse before it occurs.
I’m on an M1 MacBook Pro running Monterey. I am not using the Private Relay beta, and I have disabled nearly all of Apple’s privacy-protecting measures.
It’s been a while since I went spelunking into macOS’s logs. Has anybody done this and seen any Safari-related error messages?