https://bugs.winehq.org/show_bug.cgi?id=44985
--- Comment #46 from Gcenx gcenx83@gmail.com --- (In reply to Gcenx from comment #45)
This seems to be resolved from at least wine-7.0, I’ve tested this by not disabling this for Steam and now the Login UI is no longer black, where disabling this causes Steams Login UI to just be a black window.
After the latest Steam update this is no longer true, it's even rendered black with libglesv2 set to disabled.