Inspector and hierarchy window does not update after clicking documentation icon in prefab override window. Even when new GameObjects are created, it only shows up in scene window and does not show up in hierarchy and game window. Refer to the attached video.

Steps to repro:

1. Create a new Project.
2. Create cube Prefab > Select Instance in Hierarchy > Add Box Collider.
3. Got to Override window > Select Box Collider.
4. In the comparison window, select the documentation icon.

Actual Result:
Unity documentation opens and in Unity, Inspector window does not refresh and no new GameObjects can be created.

Expected Result:
Inspector window does refresh and Gameobject can create in Hierarchy.

Reproducible in:
2019.1.0a9, 2018.3.0b11, 2018.3.0b1, 2018.3.a7.

NOTE: Improved Prefab has been introduced in 2018.3.0a6.

Environment:
Occurs only on Windows.