GloriousEggroll has released a new custom build of their Proton fork.

Proton-6.12-GE-1

-Necromunda "glowing" fixed
-Cyberpunk 2077 inventory crash fixed
-Guilty Gear Strive video playback fixed
-Forza Horizon 4 appears playable on Nvidia now (so far from my testing it seems to run now without issue)
-Battlefield 4 multiplayer ping issue fixed -- new ping patch from upstream added https://source.winehq.org/patches/data/207990
-Civilization VI now playable
-Dirt 5 now playable
-RDR2 working again (turns out it worked before, it just needed -fullscreen option otherwise it refused to launch. added in protonfixes now)
-fixed issue where directx and/or other prefix preinstall steps would hang/fail
-added fixes for star wars galactic battlegrounds saga
-dxvk updated to git
-vkd3d updated to git and pending 2.4 pull requests added
-faudio updated

Download Proton 6.12-GE-1 from GitHub
Installation Instructions