When readying up for a match, occasionally the UI will disappear as though it is about to bring up the ToT screen, but it just doesn't. Pressing buttons doesn't do anything and the character can't move. As far as I'm aware this issue has been here since ToT released, although it used to sometimes load you into an empty instance of the area you're in where there are no NPCs or players and you couldn't enter buildings or travel. Haven't had this happen recently, but it's still a pain to lose ranking and have to force close the game because of a bug. I don't use addons or mods or third party software so there's nothing to conflict or cause this externally and I've had it happen on both PC and Steam Deck on both the regular client and Steam version of the game. It has occurred when accepting a match both indoors and outdoors and in various zones and instances including player housing.
Unsure of the cause, it seems like an issue where the game tries to take you out of your current instsnce but fails to load the ToT match and just gets stuck.

Hope there's a fix for this as it's been an ongoing issue for years now. Pipe up in the comments if this has happened to you, in case it's just a me thing for whatever reason.