Steps to repro:
1. Open the attached project and 'SampleScene' scene;
2. In the Lighting window click 'Generate Lighting' button;
3. Wait until the lighting is baked;
4. Observe the scene view rendering.

Expected result:
The light probe gizmos are lit with the scene lights but they are nor overbrightening the whole scene.

Actual result:
The light probe gizmos are overlit. See attached screenshots.
Regression introduced in Version 2019.1.0.

Notes:
- Reproducible in 2020.1.0a7, 2019.3.0b5, 2019.2.7f2, 2019.1.14f1;
- Not reproducible in 2018.4.10f1;
- Reproducible only in HDRP (versions 7.0.1, 5.7.2, 4.1.0);
- Reproducible on Windows;
- Reproducible only when baking in Shadowmask mode; not reproducible when baking with Baked Indirect;
- The issue is reproducible only in Scene view; not reproducible in the Game View.