Steps to repro:
1. Open the attached project and 'SampleScene' scene;
2. Let the scene's lighting auto-bake;
3. When the baking is finished, save the scene;
4. In the context menu select File-New Scene.

Expected result:
Light probe gizmos from the previous scene are not shown in the new scene.

Actual result:
Light probe gizmos from the previous scene are shown in the new scene. See attached screenshots.
Regression introduced in version 2019.3.0a12.

Notes:
- Reproducible in 2020.1.0a1, 2019.3.0b1, 2019.3.0a12;
- Not reproducible in 2019.3.0a11, 2019.2.2f1, 2019.1.14f1;
- Reproducible on Windows and OSX;
- Workaround is to rebake lighting for the new scene.