@kisak-valve thanks. These messages seem to be very similar to the ones that appear inside the "Show details" of the dialog. However, I don't know any modern graphics programming to be able to debug this output. In any f...
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`