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I had exported vector displacement map from both Zbrush 2018 and mudbox to test that in maya. And both of them don't work well. Then there is some weird artifact appear in edge of object.
This is my low mesh
And this is my high mesh.
My node build.
And finally my render. The weird things appear in uv seam and the edge of object.
I'm sure set vector space is tangent and set color space is Raw.
Did you try changing the displacement mode to World space or Tangent space?