Line of Sight bug with Fog of War

[kujalar]

Depressions and hilltops do not block view even when they should. For example, I have a unit under the hill and it can see and it can be seen all the way from hilltop no matter whats the distance.

It happens for example this way.

I have unit in a level 0. Then the terrain rises 2 levels as fast as possible and continues a long way. I can see another unit 20+ hexes away if it sits on level 2.
I think it should be blocked from a view.