UV Sphere slice shading weirdness

Support Lighting and Rendering
1

I have been making a hemisphere out of a UV Sphere and I noticed the shading works oddly on the poles when all faces (except the base) are smooth. A picture will probably explain better:

half-uv-sphere
half-uv-sphere1920×991 174 KB
half-uv-sphere-wf
half-uv-sphere-wf1920×991 310 KB

I can also see a similar effect (to a lesser extent) on all the faces touching the cut of the sphere.
NOTE: the part where the sphere is cut is filled with a face, so the mesh is solid.

Summary

How to properly separate smooth and flat surfaces on relatively sharp angles?

2

Object Data Properties > Normals > Auto Smooth option should do the trick.

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