What’s sad is Epic used to consider Linux a top tier support. My copy of Unreal Tournament 2004 has a tux logo on it and the Linux installer is on Disc 1. I never even played that game on Windows. Valve was very anti-Linux back then too.
Solution for Linux: look into Heroic Game Launcher. It’ll solve all your EGS Linux issues by not even using EGS client. It’s great I use it for GOG as well.