[1500] Skyline error in custom environment zones

[Roller]

Dear Command Team!

It looks like when creating a custom height in a custom environment zone, the skyline entry is simply set as double the height entry, no matter the land cover type. In attached file, as an example the custom height is set to 500 m, and the skyline is 1000 m!

Helicopter terrain masking works as normal, 1 meter below the (wrong) skyline height. I do not know what kind of effects, if any, this has on sighting etc.