Objects turn black

This is not due to lightmap UVs, partially because of how it’s behaves, and also because this bug affects dynamic objects as well (including the player). Dynamic lights light them up fine. Started to appear without any apparent cause, after I rebuilt lighting on the level one more time.

It was ■■■■■■■■■ LightMassImportanceVolume. It didn’t quite reached all the way to the floor, so everything that was on the floor was outside of it.