A new version (0.5.19) of Lutris has been released:

v0.5.19 Latest

Fix Proton integration bugs so Proton-fixes are applied
Do not offer DXVK, VKD3D, D3D Extras or DDXVK-NVAPI on Proton versions;
Proton will handle these.
The "Enable Esync" and "Enable Fsync" settings are now passed on to Proton
DXVK's integrated D8VK will be enabled in Proton
Emulator BIOS file location (used by libretro) may be set in Preferences
Obtain the release year from GOG and Itch.io.
MAME Machine setting uses a searchable entry for its enourmous list
Support for importing Commodore 64 ROMs

Download: https://lutris.net/downloads