Steps to reproduce:
1. Open project
2. Open "editor_tool_scene" scene
3. Go to Main Camera in object hierarchy and locate "Simple Screen Space Ambient Occlusion" script
4. Edit script and comment out 159-161 lines (These code lines disable and re-enable main camera)
5. Change Mode property to Integrate or Multiply

Results: You can see that SSAO doesn't change even though command buffer was updated as it for some reason needs to re-enable camera.

Note: User mentioned that sometime SSAO command buffer doesn't need to re-enable camera to take effect in certain scenes (Couldn't reproduce that).

Workaround: Disable and then enable camera in SetupCommandBuffers() method.

Reproduced with: 5.3.4b18; 5.4.0b17; 5.3.5f1