Found a workaround:
launch options: `PROTON_USE_WINED3D=1 PROTON_NO_D3D10=1 PROTON_NO_D3D11=1 %command%`
plus doing `protontricks 547930 d3dcompiler_47 d3dx9`
comment by meowmeowfuzzyface · 2018-10-08 · view · github
... 1.Launch options
PROTON_USE_WINED3D10=1 %command%
PROTON_USE_WINED3D11=1 %command%
PROTON_NO_D3D10=1 %command%
PROTON_NO_D3D11=1 %command%
Only the last ...