Proton Hotfix from Valve gets The Witcher 3 next-gen DX12 working on Steam Deck
Well, that certainly didn't take long did it? Valve have already put up an update to Proton Hotfix, that works around the crashing issue in DirectX 12 in The Witcher 3 next-gen on Steam Deck.
How to setup OpenMW for modern Morrowind on Linux / SteamOS and Steam Deck
How to install Hollow Knight: Silksong mods on Linux, SteamOS and Steam Deck