An artifacts, or a real mesh problem?

My workflow often takes me from Rhino to Zbrush and back to Rhino.

When the mesh comes back to Rhino, [after sculpting and boolean union it to a close mesh] , I now in Rhino 8 get these artifacts … Or are these actual deformation in the mesh [that will show in print?]

My guess is that this has to do with Flat shade not doing anything in R8… and that’s the smoothing artifact . In R7 and earlier, I would just turn on flat shade and the mesh will look ok.
It very small, the whole image is an area of about a square mm… So likely not an issue on the printed and cast jewsllery, but it does show up in rendering and that is a big problem.

Any ideas?

first image is in rhino, second image in ZB with polyframe on.

thanks a lot
Akash

Yeah, I have nudged that bug…

-Pascal