Invalid platform

So when launching Baldurs Gate 3 I get the "invalid platform" error message and the launch button of the game turns into a grey "install" button.

I can't uninstall the game however. Also the game files seem to be missing. I've tried to uninstall the game, at least what few files I was able to find (mostly just save files) but the App-ID folder keeps returning no matter what I do. I've then re-booted the deck and cleared the download-cache. Since that didn't work rather I've cleared all user data from my Deck but the problem persists.

I'm able to launch all other games btw.

What else can I do, do you guys have any advice?