GloriousEggroll has released an updated custom build of their 5.9 Proton fork with various fixes.
Proton-5.9-GE-5-ST
Another round of fixes for the stable version:
-Updated vkd3d -- allows Death Stranding to run with mesa RADV/ACO
-Backported a total of 36 winex11 and user32 patches from 5.9->5.13 to allow AC Odyssey black bars to be fixed
-Backports for winex11 and user32 includes untested fix: Fix Disgaea PC and Ostriv failing to launch in exclusive fullscreen mode wine-mirror/wine@ca1d31f wine-mirror/wine@c4a01d0
-Added missing patch wine-mirror/wine@0114308 which fixes Origin hanging on login (needed after adding Assetto patch which introduced the hang)
-Removed previously added Borderlands 3 launch options as they were reported to break new prefix creation on fresh installs
Download Proton 5.9-GE-5-ST from GitHub
Installation Instructions