We have encountered a mistake in our several month work on the map. When we arrive, we will arrive, we will come to a small place of the map, slowly turn dark surroundings and when we go a little further, it will return as quickly back.
We use custom objects. - We've tried to remove everything that could have reached this small area.
We use a shader. - It does not help to shut down the script.
We have not tried anything else, because we are experiencing this problem first. Please review photos and comment on the issue.
Sorry for my bad english.