Steps to reproduce:

1. Create a Universal 3D Project
2. In the Hierarchy create an "Adaptive Probe Volume" or "Probe Volume" GameObject
3. Select it and in the Inspector click "Open" in the "Adaptive Probe Volume" Component

Actual results: Warning "Item m_LightProbeSystem not found in window PC_RPAsset.
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)" logged in Console and RP Asset is opened. If the Asset is already opened, a second Inspector for that Asset is also opened.

Expected results: No Warning is logged. It seems this Warning appears as the Editor is trying to Highlight the "Light Probe System" value in the Asset Inspector. If this is the case, the Highlighting should happen.

It also appears that users can easily open multiple RP Asset Inspectors in quick succesion, this should change so that the already opened Inspector for the RP Asset is focused and the Highlighting should happen in that Asset. (This Reproduces in Unity 6 only)

Reproducible with versions: 2023.2.0a21, 2023.2.20f1, 6000.0.1f1

Can’t test with versions: 2021.3.38f1, 2022.3.27f1, 2023.1.20f1, 2023.2.0a20 (No navigational button to RP Asset)

Tested on (OS): Windows 11, macOS Sonoma M1