Grass can not receive shadows from pointlight?

Hi everyone.

It looks like grass on terrain can't recevice shadows from pointlight? look this:

But when I use directionLight it works fine.

When I use legacy deferred(light prepass) Rendering path for camera. The shadow works fine. But other part in this rendering path looks terriable.

How to make the grass receive shadows from pointlight?

Please help. Thank you very much.