*Description:*

If RenderSettings.ambientMode is set to AmbientMode.Skybox, we currently have some pretty strange behavior:

If you set RenderSettings.ambientMode to a value "myProbe", the value you will read back from RenderSettings.ambientMode is "myProbe * GammaToLinearSpace(RenderSettings.ambientIntensity)". This means that, with certain settings, the following code will visibly change the ambient probe!
{code:java}
RenderSettings.ambientProbe = RenderSettings.ambientProbe;{code}
Which seems undoubtedly incorrect.

*Repro*
- Open any project, make a new scene and bake lighting for it
- Apply this script to an object in a scene:

{code:java}
using UnityEngine;
public class ambientytest : MonoBehaviour
{
    void Update()
    {
        RenderSettings.ambientMode = UnityEngine.Rendering.AmbientMode.Skybox;
        RenderSettings.ambientIntensity = 2f;
        Debug.Log($"Probe[0, 0] = {RenderSettings.ambientProbe[0, 0]}");
        RenderSettings.ambientProbe = RenderSettings.ambientProbe;
        Debug.Log($"Probe[0, 0] = {RenderSettings.ambientProbe[0, 0]}");
    }
} {code}
- Observe that the ambient probe explodes to infinity.

*Full info here:* [https://forum.unity.com/threads/setting-renderersettings-ambientprobe-changes-its-value.1363183/]