When the viewport is in Top (ortho) Lit mode the near plane clips through geometry as you zoom the view in and out.
Expected
The top of the cone is not clipped when you zoom in
Actual
The top of the cone is clipped. Disabling r.Ortho.AllowNearPlaneCorrection fixes the issue, but you get other lighting issues like noisy shadows.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-221499 in the post.