Nanite mesh shadows not updating when CSMCaching enabled

A Nanite primitive casting a CSM shadow on another Nanite primitive with "Cast Shadows" disabled, will have it's shadow disappear completely when r.Shadow.CSMCaching = 1.

1. Set your project to to use CSM (disable VSM and RT shadows)
2. Create a basic level
3. Add a sphere
4. Set r.Shadow.CSMCaching to 1
5. Convert the sphere mesh to nanite
6. Move the sphere mesh

Expected

The nanite mesh casts a shadow that updates when the mesh is moved

Actual

The nanite mesh does not cast a shadow and the shadow does not update when the mesh is moved.

If you add another non-nanite sphere to the level and move it around, it will cause the CSM to be invalidated and both sphere shadows will be updated.