On steam deck I mainly use dodi repack.
From what I heard fit girl often do mistakes in repackages. (If someone is curious I can look for the game I had problem with, from memory that was a simple steamid missing in a crack)
The trouble is once a version is out you can't patch it.
I will try dodi's version. I'm not interested in playing fps's on my steam deck. I tried playing borderlands with a controller and it was an awful experience.