It would seem if you have DXVK_CONFIG_FILE set then DXVK_CONFIG is acknowledged but ignored.
DXVK_CONFIG_FILE
DXVK_CONFIG
DS_d3d9.log
Works fine on my end, not sure what's going on here.
proton experimental
Software Information
It would seem if you have
DXVK_CONFIG_FILEset thenDXVK_CONFIGis acknowledged but ignored.System Information
Log files
DS_d3d9.log