Steps to repro:
1. Open attached project and 'repro' scene;
2. In the Hierarchy select 'Light Probe Group' gameobject;
3. Observe the light probe gizmos rendering in the Scene view.

Expected result:
Light probe gizmos are rendered as yellow spheres .See attached expected.png screenshot.

Actual result:
Light probe gizmos are corrupted. See attached actual.png screenshot.
Regression introduced in 2019.2.0a4.

Notes:
- Reproducible in 2019.2.0a4, 2019.2.0a3, 2019.2.0a2;
- Not reproducible in 2019.2.0a1, 2019.1.0b2, 2018.3.5f1;
- Reproducible on Windows 10;
- Reproducible only after project upgrade; not reproducible after adding a light probe group gameobject in the new project.