How to reproduce:
1. Open the attached "IN-87855" project
2. Open the "SampleScene", ensure that Scene view is focused on the “Cube” gameObject
3. Ensure that Screen Space Ambient Occlusion (SSAO) is toggled on in Assets/Settings/PC_Renderer.asset via the Inspector window
4. Navigate to the Scene window and locate the “Toggle skybox, fog, and various other effects” menu in the “View Options” Overlay
5. Toggle “Post Processing” off
6. Observe the Scene window
7. Toggle “Post Processing” on
8. Observe the Scene window again

Expected result: SSAO is toggled on and off
Actual result: SSAO effects are on

Reproducible in: 2021.3.46f1, 2022.3.53f1, 6000.0.29f1, 6000.1.0a6

Reproducible on: Windows 10, Windows 11
Not reproducible on: No other environments tested

Note: SSAO effects appear much softer in 2021.3.x than in later versions, but the issue is still observable