Valve has released another update for Proton: Proton 6.3-7.

6.3-7:

The following games are now playable:
Life is Strange: True Colors
Quake Champions (broken after a game update)
Divinity Original Sin 2 (broken after a game update)
eFootball PES 2021
EVERSLAUGHT VR
WRC 8, 9 and 10
Fix Logitech G920 mapping for F1 2020.
Fix Resident Evil Village display settings.
Improve Forza Horizon 4 windowing.
Update DXVK to v1.9.2.
Update vkd3d-proton to include the latest development work.

Also Proton Experimental has received another update:

Available in Proton Experimental (as of 2021/09/30):

All changes from Proton 6.3-7.
Performance improvements around input, windowing, and memory allocation.
Added support for Vulkan child window rendering.
Updated file distribution method to save disk space.
Resident Evil Village, Forza Horizon 4, Microsoft Flight Simulator, F1 2021, Assassin's Creed, Anno 1404 - History Edition and Mass Effect Legendary Edition are playable.
Fix Splitgate: Arena Warfare hangs and multiplayer performance issues.
Fix window contents rendering in recent Uplay update.
Improve compatibility with DLSS versions shipped with some games.
Fix Pathfinder: Wrath of the Righteous freezing when loading maps.
DEATHLOOP is playable.
Fix regression causing networking problems with HITMAN 2 and Death Stranding.
Fix The Sims 3 and Victoria II launcher crashes.
Support DLSS in DX12 games (guarded by PROTON_ENABLE_NVAPI=1).
Fix crashes in Project Wingman, Satisfactory and other Unreal Engine 4 games using the Vulkan renderer.
Support latest Steamworks SDK.
Update vkd3d-proton to recent development branch.
Update DXVK to recent development branch.