Quick question - VFX x Shadergraph Vertex Position

So i made a shader in hdrp shadergraph using the vertex part, so it could morph and stuff.
However, when I put it into VFX graph, the parameters I set for color and alpha transfer fine, but the vertex position deformation doesn't work.

I thought maybe I did something wrong, so I put the shader on a normal low poly plane, and the deformation worked fine.

Does vfx graph fundamentally not work with the vertex parameter in shadergraph? Or am I missing something?

I'd share the graphs, but this is more a fundamental question than anything. Has anybody been able to spawn meshes from a vfx mesh output that deformed using the parameters in the vertex portion of the shadergraph asset? Does anybody know why this wouldn't work?