It's unplayable on Steam Deck (OLED)

Hello, I bought the game, and the only thing I can do right now is free roam... I've tried all the most recent versions, and here's what happens...

When I launch the "Leisurely Driver" scenario, the game crashes. This also happens with other scenarios, campaigns, etc. Some things work sometimes, but I never know if what I'm about to launch will work or crash the game. The "Danger Miramar" scenario only works with Proton 10.01-beta.

Sometimes, when it does work, the car and the ground load after the loading screen, and remain invisible for a while.

It also happens quite often that I get the message "Power disconnected," with an indicated operating system (Windows 10 or 7) that isn't mine (I'm on Linux, the Steam Deck OLED was purchased from Valve, and I've never installed Windows on it).

I haven't installed any mods. I've already tried setting the in-game graphics settings to "Steam Deck."

Restarting the game or reinstalling it hasn't changed the problem. I obviously don't expect to run it at the highest performance; I just want to be able to play normally. I don't mind having to stay at 30 FPS and having graphics set to low, I just want to be able to play.

Thank you very much for your help!