lwrp shader not working in hdrp

Heya,
I've been trying to find a way to achieve a shader graph interactive grass shader.
Amazingly, dburke on reddit (https://www.reddit.com/r/Unity3D/comments/b8yvx7/shader_graph_interactive_grass_shader/) nicely posted a Unity package including such a shader that works perfectly in a light weight render peipeline Unity project.

Now my problem is that the current game i am developping is using the high definition render pipeline, and when i try using this shader in my project, the mesh on which it is attributed just turns invisible, you cannot even see the outline of the mesh. I also don't get any errors in the console. I thought that shader graph shaders were compatible in both Pipelines, but it seems that certain shaders are not.
Could you please explain why this shader won't work properly in my hdrp project?

(You can find a copy of the specific shader linked *here*)

thankyou,
Alex