That all cards do have different brands doesn't matter to the BIOS bug.

If there is a bug, which maybe is there since AMD delivered the structure for this Card and this BIOS, then it could be that this bug is related over more brands/various cards.

Maybe (I'm working at a electronic devices manufacturer) there is a SMD-Device with a failure.
That might explain (if so) why there are several cards all over the place, that seem to have this behaviour.

Maybe we will never find out (I do not hope that, but who knows?).

I'm searching.