Reproduction steps:
1. Open the attached “Repro” project
2. Open “Assets/SampleScene.unity” Scene
3. Select the “Box Volume” GameObject in the Hierarchy window
4. Press the “Add Override” button under the Volume Component in the Inspector window
5. Observe the Inspector and Console windows

Expected result: Volume overrides context menu appears and no errors are present in the Console
Actual result: Context menu doesn’t appear and a NullReferenceException error gets printed in the Console

Reproducible with: 2023.2.0b13, 2023.3.0a10
Not reproducible with: 2021.3.31f1, 2022.3.11f1, 2023.1.17f1

Reproducible on: Windows 10 Pro (22H2)
Not reproducible on: No other environment tested