Excluding Post Processing Effect being applied twice on an Overlay Camera (despite having post processing checked off in that camera)

Unity Engine
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I was following along the docs here so that I could exclude certain objects from Post-Processing effects. The issue is when I did what it said, the overlay camera seems to affect everything despite setting the culling mask to only the layer I want to exclude from Post-Processing. I don’t really understand what I’m doing wrong. I’m on Unity 2021.3.32f1

https://docs.unity3d.com/Packages/com.unity.render-pipelines.universal@12.1/manual/camera-stacking.html

This is the main camera

image1
image1408×514 13.2 KB

Culling Mask for the main cam (I don’t want OW-VFX affected by Post Processing)
image2

This is the overlay camera
image
And as you can see it’s culling mask is set only to OW-VFX

This is my game with the Overlay Camera deactivated

image
image1193×683 73.8 KB

And this is when it’s activated

image
image1198×675 27.1 KB

I also checked the frame debugger and confirmed that it’s doing a Post Processing Draw call on the overlay camera, so it’s re-applying all post processing effects to the rendered image. This seems like a bug to me.