Know the official support boundary
Pocketpair's official mod-loader documentation currently lists the Windows Steam client and Windows dedicated server. It does not list the Xbox app WinGDK client or Xbox consoles, so a Workshop package that works on Steam must not be assumed compatible with Game Pass.
Treat manual WinGDK mods as author-specific
Some third-party authors publish a separate WinGDK build or manual path. Follow only instructions that name the current Game Pass revision, keep a backup outside the install directory and test on a disposable save first. A Win64 DLL or Workshop-only package is not evidence of WinGDK support.
Recover cleanly after updates
The Xbox app can replace modified files during an update or repair. Keep original downloads and save backups outside the game directory, remove legacy files before verifying the base game, and wait for the author to confirm the new revision before reinstalling.