It’s definitely a sim issue, because it CAN display proper blacks as long as there is something else on screen. Used ReShade here to measure the HDR picture. Just put me on a random runway at night in the A400, nothing special and easy to replicate.
Looking back from the cockpit with some lit elements on screen looks fine. Minimum Nits of 0.01 are fine and look good on my OLED screen.
And then just pitching the camera down a bit to look in the pitch black at the back of the cockpit it starts raising the black levels to average and minium of about 0.45 Nits, which looks like a muddy brownish haze that looks terrible. Can even see that on the screenshot here, when comparing to the ReShade elements, that the black is nowhere close to being proper black.
Probably a bit of code here trying to make kind eye adaption? If so, please remove. Can’t see anything either way, and the raised blacks just look terrible on an OLED screen. And we always got the option of the flashlight to see where we are going 