Faulty Shading using 'CapPlanerHoles' method

Hello Community,
I always get shading problems when using RhinoCommon Brep.CapPlanerHoles method, no matter what kind of geometry I have:

1. I created a Rectangle3d, made the boundary surface end extruded, and then capped it;
2. extruded a closed curve using Surface.CreateExtrusin method, then capped;
3. used Sweep1 along a curve ( Brep.CreateFromSweep), then capped.
   In all cases, resulting geometries are clear before capping.
   After capping I am getting ugly, jagged shading(however, the geometries look normal).
   Can anyone, please, advise me what is the cause of this or could you give me some hints on how it is possible to resolve this issue?
   I have read @Helvetosaur’s post (Surface.CreateExtrusion) and Menno Deij’s answer but I still can not find out …
   Thanks.
   

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