My SFX do work, so does that mean that Miles is recognizing those files, but not the music ones?

Recently, I've been getting no music on FoG II or FoG Empires and it was working perfectly fine before then. I'm on Ubuntu and I recently updated to the new version of Steam Proton, which I think may have something to do with it. I tried to change back to the old version though, and still nothing. I...