I've imported from Plasticity an OBJ, and even without Ngons I still got this mess at the angles of my mesh:
I've tried manipulate UVs, using a normal map and assign to the roughness attribute, using Normal edit and Weighted normal modifiers (Getting only bad results), reducing the face count, export the mesh with triangles or quads, remeshing and re-beveling the edges in Blender with a similar geometry (I was thinking that maybe Plasticity was the problem) getting the same results.
I don't get it why the reflections can't be continuous, and I constantly change between auto-smooth and smooth shading (Even if in this case is totally useless) because for what I seen elsewhere it's either a normal problem or a topology problem.
Here's other pics for better understanding: