There is misty from the beginning of the mission and unlike the ice that you can disappear, misty does not disappear until the end of the mission, these are dangerous environments as not everything is easy to spot!
Not sure about this because it’s very similar to Darkness, which we already have.
It does raise the question if perhaps Darkness should be an environmental effect rather than a mission type though. Perhaps on planets that are very distant from stars? That would seem more consistent to me, seeing as it’s an additive “effect” rather than a fundamental gameplay change that warrants a different mission type.