How to deal with Black Shadow in Ceiling

If the overlapping part of the ceiling/floor is flickering, please check if the height from the top is set to 0. The minimum value for the height from the top in custom ceilings and walls must be 1 and cannot be 0. If it is 0, it will overlap with the original ceiling/floor.

To fix this:

  1. Enter Custom Ceiling modeand double left-click on the ceiling to enter the 2D design frame.

Change the height from the top to 1.