Not particularly, I'm not sure I understand what it is. With Substance painter I regularly release a normal map, basecolor, OcclusionRoughnessMetallic. But I don't have this problem when I import them on max or unreal for example.
Didn't know polycount was that old damn. I think only problem with new theme is some elements could be separated. For example a line here? Or lighter background there to separate top part from actual text. Also text box is pretty much not visible
the trouble usually come from the miss matched normals (when you stitch in the geometry this is not an issue) at the seam. for example.... the cyinder on the right has the normals at the seam edited to be the same as the plane.