Just had a game where I was able to read chat from a different game than the one I hosted.
According to chat messages from other players I came up as unknown in the game I was actually playing (was host) and as joining in the other one.
Not sure if this is reproducable as I used the method to cancel an accidental qp multiple times now but cant remember this happening before.
This is definitely reproducable, I also had that bug already and I did the exact same steps you did, but it doesn’t happen always from my experience.
I think this might also be one cause for the problem with players “joining forever”, where you see the player joining in the ui, but he never actually joins.