If you check your server in Steam server browser, that there are "players" and "scores", so here's the twist: it just won't update whatsoever, then you will soon realize the game state is in freeze; if you try to join the server, it just got pitch dark and it disappointed me that I waited only for a connection timeout.
There's no trace of what has happened nor there were any minidumps/coredumps to analyze on, but I could confirm that the tickrate was unusually abrupt and I even got it playing with others -- game state is completely frozen until we all have been timeout'd.
I was running the server in Docker with LGSM with kernel 4.18. I don't believe it has anything to do with userland Docker socket proxy though.
It just happened again. After having 3 games in a row on my own server I got the infamous door bug again. In the previous bug I was able to shoot the hinges to forcefully detach the door, now I have to either push it or use explosives to break the door wide open, or we will risk getting shot by bots through the bugged door. I believe this has something to do with seamless world travel. BTW if your push the door from the inside you are able to close it by moving it back -- still not interacting with the use key and no close sound.
Same in Linux, it seems like the map vote is not yet implemented. The only workaround is to extend the length of the game.
Also, if I quit the game with Ctrl+C, it will just show
FUnixPlatformMisc::RequestExit and still stalls