Edges like artifacts appear when 'Global Illumination' is enabled and curved game objects are (Eg. sphere) marked as 'Static'

Steps to repro:
1. Open attached or a new project
2. Hierarchy > right click
3. 3D object > sphere
4. Select the sphere and enable static property
5. Window > rendering
6. Lighting settings > enable global illumination setting
7. Enable auto-generate property lighting

Actual Result:
Observe the artifacts on the sphere, it looks like it's having edges

Expected Result:
1. The surface of the sphere should appear smooth
2. Light on the sphere should be smooth, currently, it looks like a patch

Environment:
Windows and Mac

Occurring with:
2018.3.0a4, 2018.2.0f2, 2018.1.6f1, 2017.3.2f1, 2017.1.4f1