Adding to this, Tametsi works for me on Proton 5.13-6, but on Experimental or 7.0-1 I get the same behaviour as listed above.
This should be working on both 8.0-3rc and Experimental now.
See upstream dxvk PR https://github.com/doitsujin/dxvk/pull/3392
Compatibility Report
System Information
I confirm:
Symptoms
Game launches to a black screen, can't interact with the game at all.
Seems to run on older proton versions or using wineD3D, but that causes high CPU usage.
Reproduction
--
steam-709920.log