For real, it probably disconnects your steam deck from the session. What happens to the game, I dont know. Likely drops the session on their end as well from connection loss. If they have connection loss protection redundancies, then you should be able to start up at the point you lost connection, or at the very least close to it. If not, then you probably lose alot of progress since last proper disconnect or proper save.
Your deck explodes.
For real, it probably disconnects your steam deck from the session. What happens to the game, I dont know. Likely drops the session on their end as well from connection loss. If they have connection loss protection redundancies, then you should be able to start up at the point you lost connection, or at the very least close to it. If not, then you probably lose alot of progress since last proper disconnect or proper save.