On switching the Graphics API to Vulkan and then building a player leads to the gizmos disappearing from both the scene view and game view once the build is finished even when gizmos toggle is set to visible.
Refer to the attached video.

Steps to Reproduce:
1. Create a New Project
2. Edit > Project Settings > Player > Other Settings
3. Uncheck Auto Graphics API for Windows
4. Add Vulkan and restart Editor as prompted
5. Build player

Actual Result:
Gizmos disappear once the build is finished

Expected Result:
Gizmos remain as they were before building

Workaround:
Gizmos reappear after
1. opening gizmo dropdown list and checking\unchecking any gizmo
2. Selecting any GameObject in scene or hierarchy

Occurring on:
2020.1.0a20, 2020.1.0a9

Working Fine on:
2020.1.0a8, 2019.3.0f5

Environment:
Windows only

License type: Free