When r.RayTracing.Shadows.Translucency is enabled, the directional light source angle causes distant shadows to blur and fade out.

I have encountered an issue with translucent shadow casting in Unreal Engine 5.7.When ray-traced shadows are enabled, the directional light Source Angle causes shadows to blur and disappear depending on camera distance.The issue is resolved when I set the Source Angle to 0.However, I still need soft blurred shadows.I would like to know the solution, and which console commands can fix this problem.