Atmospheric Fog disappears when viewed from below configured altitude

[djmrFunnyMan]

(Tip: Set weather to rainy to make fog more visible)

Going below the configured "Atmospheric Fog Altitude" and looking up you'll notice that anything above that point renders clearly through the fog (or the fog itself doesn't render, not sure) This looks quite wrong because as we know objects further away should be even more obscured by the fog.

This issue is especially noticeable on custom worldgen, custom maps or if you have a non-default fog altitude set.

More examples: