Negative Fog BaseHeight generates wrong result.

Unity Engine
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1

Unity3d 2021.1.17

I have got terrain at position y = -100. (Negative Value)
I want to have height for just above the ground. (about 1 unit)
I set BaseHeight to -99 and MaxHeight to 3 the result is not what is expected there is no layer of fog.

But when I move my terrain to position y = 0 and set BaseHeight to 1 and MaxHeight to 3 I do see a layer of fog on the ground.

2

OK case resolved. Maximum Height is an absolute value.
So for position y= -100 I should have BaseHeight = -99 MaxHeight = -96