Steam Deck Crash with Mirror + FizzyFacepunch

[dhamster]

My project uses Mirror with FizzyFacepunch transport based somewhat around the Mirror Room Example. Normally it works great, but I am seeing that if Steam Deck users host a game, the Steam Deck crashes to desktop after the client connects. The client does successfully enter the host's room, but the host's game crashes.

From the logs it seems to happen after OnConnectionStatusChanged completes in Mirror.FizzySteam, but before NetworkRoomManager OnServerReady would normally trigger. Image is a photo of the Deck user's log right before they crashed to Steam Deck desktop. From the client's point of view, the connection is successful, but the host is gone.

[dhamster]

And here's the crash log from the user's Steam Deck: https://drive.google.com/file/d/1rDJQpFCVn6hY2t2boR3sTy8rbsRkzvK6/view

[dhamster]

I have resolved the issue by making a Linux native build instead of relying on proton. This indicates an incompatibility with proton somewhere, though.