I created a scene using HDRI in which an airdrop is there on ground but airdrop shadow is not visible which makes it looks unreal. I've used a shadow catcher and it is even having particle system to imitate grass like structure but shadow is not visible. What should I do? P.S. Model requires some work.

Here's render preview:
[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/5hfJ7.jpg