Well, that is unfortunate.
Thanks for trying, though.
This one was done in FP 7.2.1
I will give it another try using the latest update 7.3.0.
UPDATE:
The effect is also not functional in version 7.3.0 (at least not on my workstation in 3ds max 2022)
Any ideas?
UPDATE 2.0:
It works.
It depends on which type (2D / 3D) of the VRayDisplacementMod is used.
However, in order to use a procedural map, it must be set to explicit map channel.