Steps to repro:

1. Open attached project and 't1' scene;
2. Wait until baking is completed
3. Enter into Play mode
4. Reload the scene by pressing `Space` bar
5. Observe the scene.

Actual result:
Light probes data in the scene is removed after reloading the scene. See attached video.

Expected result:
Light probe data is not removed after reloading the scene.

Notes:
- Happens only in Editor; not happens in the Standalone build;
- Happens in 2018.2.0a1, 2018.1.0b3, 2017.3.0p2;
- Happens on Windows and Mac.