Reproduction steps:
1. Open the attached project “TestProject”
2. Open the “Assets/OutdoorsScene.unity” scene
3. Select the Main Camera GameObject from the Hierarchy
4. Observe that the "Physical Camera" option is enabled on its Camera Component
5. In the Hierarchy enable the “CM vcam1” GameObject and select “Lens/Advanced/Mode Override/None” in the attached CinemachineVirtualCamera Component
6. Observe the “Physical Camera” toggle on the Main Camera GameObject

Expected result: The Physical Camera toggle is enabled and editable
Actual result: The Physical Camera toggle is disabled and uneditable

Reproducible with: 2.9.2 (2020.3.44f1, 2021.3.16f1, 2022.2.3f1, 2023.1.0a26)
Not Reproducible with: 2.9.0-pre.6, 2.9.1 (2020.3.44f1, 2021.3.16f1, 2022.2.3f1, 2023.1.0a26), 3.0.0-pre.4(2022.2.8f1, 2023.1.0b6, 2023.2.0a4)

Fixed in: 2.9.4 (2020.3.44f1, 2021.3.16f1, 2022.2.8f1, 2023.1.0a26)

Reproduced on: Intel macOS 13.0.1