Thanks for looking into it Sam. Since I don’t have a local repro, the only other option is to enable DF shadows again and change the check to a checkf to log out the number of planes. Would that be helpful? There have been some reports around this, though not very helpful Assertion failed: NumPlanes <= 12 [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Renderer\Private\DistanceFieldShadowing.cpp] [Line: 583]