Larian have updated Baldur’s Gate 3 with Hotfix #35, which includes more improvements to their Native Linux build supported on the Steam Deck with SteamOS.
Did you miss it getting a Native version? See the previous GamingOnLinux article for the info. They’re still specifically calling it “Steam Deck Native”, but it’s just a Native Linux version with tweaks for the Steam Deck included. It will be interesting to see how this sort of language evolves, especially with the new upcoming Steam Machine.
You can export the steam linux runtime, right? That might be why it’s not in the other releases, since they can’t include it by default (presumably).