Exact Normals

By default SP doesn't calculate accurate normals on NURBS and Bezier patches because it has a significant performance cost. However you can switch it on per object, from the N panel or from the meshing modifier. Most the difference is on boundaries.

For further quality you can enable EEVEE high quality normals

N-panel toggle (applies to selected object)

Modifier toggle

Comparison

Default	Exact	Exact + High Quality