I've seen the bug with my very eyes because I wrote that renderer and I did test on all three vendors:P

Zero debuginfo-related warnings on any driver (except the usual "buffer location is VIDMEM" spam), NV is fine, intel is fine, my (RDNA) AMD card is fine on both Windows and Linux, user with a Vega 64 isn't fine.

We dug into it together and it literally swaps the colours somewhere, and the user said that it crashes randomly on games (confirmed by others, not one-off HW failure), does the same colourswap or have very glitched rendering.

I guess the only salvation is that people usually play DX games under Windows and the bug didn't happen over DX11. But the same rendering restricted to even standard GL3.3 just got BGRA-swapped.