Repro steps :
1. Open attached project (search in the case for "Repro project")
2. From the Project tab, open Assets/Scenes/SampleScene.unity
3. In the Hierarchy tab, select GI
4. In the Inspector tab, switch Tracing Mode from Ray Marching to Ray Tracing

Expected results: Mode is switched to Ray Tracing and the colors remain the same
Actual results: GI becomes ray-traced but also shifts toward a greener color

Reproducible with: 2021.2.0b4, 2022.1.0a2 (HDRP 12.0.0)
Couldn't test with: 2018.4.36f1 as it requires outdated versions of HDRP, 2019.4.29f1 (HDRP 7.6.0), 2020.3.14f1 (HDRP 10.5.0), 2021.1.15f1 (HDRP 11.0.0) as there is no way to change from Ray Marching to Ray Tracing

Additional info :
- Without denoiser on, you can't see the green hue, so might be related in a way
- If you disable the effect and re-enable it, there's no issue anymore, the color is now correct again
- To be able to repro again, the Tracing Mode needs to be switched to Ray Marching, and the project has to be relaunched

Environment :
- Windows 10