The outline and tint that shows the current selection in Scene view gets corrupted by SSAO Pro plugin, ends up not showing correct parts occluded or just entirely broken.

Steps to reproduce:

1. Open attached "HiddenOutline.zip" project
2. Open "Hidden" scene
3. Make sure that camera has SSAO Pro attached and enabled on it. (No matter the settings)
4. Select cube or plane in scene view and move around.
5. You should see corruptions in outlines or the selection tint on the plane.

Expected outcome: The outline of the object shows a different tint of orange to the part of the object that is not covered.
Actual outcome: Sometimes the outline would show the entire object as if it was not covered. Sometimes the plane would have large white areas where orange tint should be

Reproduced on: 5.5.2p4, 5.5.3f4
Doesn't reproduce on 5.6.0f3

Can't test for regression cause 5.4.x doesn't have orange outlines