Now, if you play the Nightmare Killer character, the game suddenly disconnects.

I can't figure out under what conditions the game is cut off, but

While playing the game in the normal way, all players in the game room will be disconnected with the message "Connection with the host has been lost". This means 3 out of 3 games are disconnected while playing the Nightmare Killer character, and even though you are playing Survivor in a new game, an unknown Killer picks up Nightmare and sends one Survivor to the side of the Entity while playing All game. this is broken

If you play Nightmare now, you will witness sudden disconnects during the game without any specific conditions.