Can someone produce a minimal materialX file that loads directly in assetreference, and produces a working material ?

This must have a displacement node inside; the ones that ship with the AMD GPUOpen library in MatLinker never have a displacement texture, which is unfortunate, because some sources of their material actually have displacement; support told me they can't do anything about it because it is made by AMD.

One starting point could be a mtlx file from:
ambientcg.com
https://ambientcg.com/view?id=PavingStones141 [ambientcg.com]

which has the usual PBR textures + displacement.

The displacement scale is typically too high, so I can definitely scale it down beforehand.
But after it's loaded in assetreference, it kinda works, then breaks as soon as I try to edit it.
I have then to recheck each file checkbox inside the network after it's loaded in Edit Material Network to make it work again