With Lumens on how do I remove Directional Light Ray Traced Shadow artifacts?

With Lumens on With a Single Directional light With Raytraced shadows turned on I get these artifacts. How to I remove them?

Found the solution
r.RayTracing.Shadows.EnableTwoSidedGeometry = 0

But disable raytracing two sided geometry is not perfect… at the end you can see is the fallback error: