If you are in middle of changing the keybinds on a server, as example, while you're in the waiting lobby. If you get teleported from the waiting lobby to the other world or server, or something, you can't control the game anymore, not even if you disconnect, you're just soft locked and are forced to restart the game.

1. To reproduce this, join a server
2. Go into a mini game
3. Open the keybinds settings and click on a keybind so that the text turns yellow
4. Now wait for the server to teleport you

Basically, you just have to somehow get teleported and the game has to somehow close the settings screen, and you should be able to reproduce this issue.