My displace shader is not doing anything. Looking at the vex code generated by the material shader builder VOP I only see the surface shaders code being generated. Attaching a seperate displace shader in the displace slot displaces the geo as I expect.

It did work for me but only when I used that “Displacement Shader” parameter you exposed on the geometry obj.
I also tested creating a new geo container and object merging the geo from the first container and then applying your shader in the material slot and it worked fine. My guess is that by adding the “displacement shader” rendering parameter you bypass the material displacement capability.

Cheers

You're right, it was the displace shader parameter. Good thinking.