Yeah, I had the same thing. Similarly to Proton-GE, my build of proton-tkg plays the first few notes of the menu theme, then crashes. Curiously, it doesn't crash when winegstreamer is disabled, so you might very well be ...
FYI the game was fully playable with older 5.X proton such as 5.0-10. (beat story boss at least) Game also seems to work fine on Proton-5.21-GE-1. However it crashes on Proton-6.21-GE-2 as well. This is most likely video...