On changing the Light type, its respective gizmo doesn't update until the gameobject loses focus or the component is collapsed in Inspector.
Refer to the attached Video.

Steps to Reproduce:
1. Create a New Project
2. Hierarchy > Directional Light > Inspector > Light > Type > Spot/Baked/Area

Actual Result:
Light gizmo doesn't update when the light type is changed, until it loses focus

Expected Result:
The gizmo should update along with the light type immediately

Occurring on:
2020.2.0a4, 2020.1.0b2, 2020.1.0a12

Working Fine on:
2020.1.0a11, 2019.3.6f1

Environment:
Windows 10 and macOS 10.14, 10.15