shadow disappearing with Instance Static Meshes ISM

Hi

we are having a shadow issue with instance static meshes ISM. When the camera is getting far from a ISM the shadows disappear.

I recorded this video to show the issue. the Green cilindres are an ISM and the red one are individual instantiation. When we zoom out you could see how the shadow of the ISM desappear. I tried a lot of setups but the issue still there. We are not using nanite.

Thanks

Julio