Run Ensemble8 demo from apps/samples/Ensemble8 and select 3D Sphere demo from 3D demos on macOS(Which will run on OpenGL pipeline).
This artifact is not seen in D3D pipeline on Windows.

Select only specular map and some specular color. There is a black artifact in the middle of the sphere.

This is seen only in M1 and Intel Macbook which has integrated SoC and not when we use Macbook with AMD discrete GPU.