Steam Deck -- internet multiplayer, crashing

Hello all! A while back, I used to be able to play single player Grim Dawn on my Steam Deck. However, last Saturday, I tried to play MP with my brother, and I saw the Internet option had a lock on it, and no matter what I did (such as disabling firewall or trying both in gaming and desktop mode), I could not host or join internet MP. Is this normal? Does Internet multiplayer not work on the Deck?
I read a Reddit thread about the same issue from about 1.5 years ago, which suggested rolling back to the previous version, as for that OP, it was the newest update that broke internet MP. So, I opted in to the previous version “beta”, after which Grim Dawn started CTDing immediately. I tried going back to the current version, reinstalling it on the internal storage, uninstalling it and installing it on the SD card, nothing helps, Grim Dawn keeps crashing on the main menu. Is Grim Dawn still working on the Deck for others?