C4D is giving suspectly good result, because usually any other package will give you weird shading if you mess with the geometry at a vertex/poly level.
That's said 3Dsmax shading mess seems quite extreme here, like if vertex normal from the new added geo if just missing, or set at (0,0,0).

Yeah that does look like the vertex normals are ending up as 0,0,0 . But also having the entire polygon pitch black probably means the entire polygon's vertex normals are ending up as 0,0,0 - if it was only some vertices you'd probably see something more like black streaks emanating from the 0,0,0 ones.

- Michael