Raytraced Shadows don't render on landscape grass

Regression: Tested in UE5/Release-5.0, the issue did not occur so this is a regression

Cast Dynamic Shadow should be enabled in the Landscape Grass Type by default, so shadows should be cast by the mesh used by the grass.

1. Create a new Blank project with an Empty Level
2. Create a new material
3. Create two Constant Vector 3 nodes and set them to different values
4. Create a Layer Blend node
5. In the details panel, create two elements to the Layer Blend node with two different names
6. Plug in the two Vector 3 nodes to the Layer Blend
7. Plug the Layer Blend node to the Base Color
8. Create a Landscape Grass Output node
9. Create a Landscape Layer Sample node and connect it to the Landscape Grass Output node
10. Set the parameter in the Landscape Layer Sample node to "Grass"
11. Create a new Landscape Grass Type in the Content Browser
12. Set the Grass Mesh to a static mesh (tested using Cylinder)
13. Set the Grass Type in the Landscape Grass Output to the new Landscape Grass Type
14. Create a new Landscape and assign it the created material
15. Add a directional light to the scene
16. In the details panel, enable Cast Ray Traced Shadows on the Directional Light

Actual Result: Cylinder grass does not cast any shadow on the terrain.

Expected Result: Cylinder grass casts shadows along the terrain.