This also happens if I place something in the world from the content browser. It strangely doesn’t seem to happen in very few selected areas. I try to show this off in the video, and I also show that sometimes you can undo into the effect.
(Lightmass volume seem unrelated from my testing)
Worthy of note is that the dark lighting also affects my 3rd person character.
I am not exactly sure if i understood the part with “this happens after building my lighting” correctly; But as soon as you move/copy/change any mesh, you will have to rebuild lighting for shadowing and lighting to look correct. If you dont want this, you can try using dynamic lighting only, then you wont have to build lighting, but this would be MUCH more performance intensive then.
