To reproduce:
1. Open attached project;
2. Open "test" scene;
3. Make sure Allow HDR is enabled on the "Main Camera";
4. Make sure Lighting is enabled on the scene;
5. Make sure Allow HDR is disabled on the "TestCamera";
6. Open Test Window (Window > Test Window);
7. Press "Start Test".

Expected result: Cubes are sorted correctly when using Handles.DrawCamera().
Actual result: Cubes are sorted incorrectly when using Handles.DrawCamera() (notice that shadows are rendered correctly).

Reproduced in: 2017.3.0a7, 2017.3.0b7, 2018.1.0a2.
Not reproduced in: 2017.3.0a6, 2017.2.0f3.
Regression introduced in: 2017.3.0a7.

Fixed in: 2018.1.7f1