I'll try again. I tried both native Linux and a dozen Proton builds, and none would load, even with no mods or DLC. I'll try again with the latest, and if that doesn't work, I'll try the flatpak instead of via RPM Fusion.

There is a note on protondb about needing the most recent proton-ge release. Use ProtonQT flatpak, should help you install / maintain proton-ge versions. Will get you the latest updates as they release.