I said it was most likely an update that just slipped under our noses, but now I’m aware it isn’t.
Also the reason it doesn’t work on 8.x but works fine on versions below it is because of a dumb server bug that was introduced in the live server running on m1.escargot.log1p.xyz - the profile message that is sent by the server after successful login that Messenger needs is only sent to clients using MSNP12 and below (so around 7.5 and below) and protocol versions after (around 8.0+) don’t get it. From what I can piece together the client needs the info in the message to create the storage for custom emotes, display pictures, etc., for each user, and when it doesn’t get that info it starts to act up and not set/retrieve the user data properly. On the live and master branches (master is the one with the code for the upcoming release) in our GitLab repository this bug isn’t available, so I can only deduce this happened on the bare metal valtron is running his Escargot server on. I’ve contacted him about the issue and hopefully he gets back soon.