Can't make a Post Process Overlay Camera

Hello everybody

I’m working on my first project in Unity, I’m used to dev on Unreal.
I’m really struggling with Unity Camera System.
I’m trying to have a main camera rendering my scene with a first general post processing effect (saturation, color, etc…) and a second camera with a bloom effect that I use for a laser effect.

But I can’t make it right, the closer I have to what I want is a camera that is rendering the bloom effect as a main camera, and my overlay camera which render the rest without any post processing.
But if I do it this way every object with a bloom effect is rendered behind normal objects.

That drop is supposed to be in front of everything


But in fact it is rendered behind everything in game

Here are my camera settings :
(can’t put more than one image…)

I already tried to put the camera that render without the Post Processing as a main camera and add the bloom camera as the overlay camera. But when I do that the bloom effect affect every object on my scene.
I tried everything I could think of, playing with camera culling masks, trying to do stuff with the volume mask, using the volume on the first camera, on the overlay one, changing camera priorities. Nothing work.

I also tried to not use the overlay cameras, but whatever I do, the first camera in priority completely override the camera behind.

It’s been 3 days I come back to that issue with new ideas but I can’t figure out what I’m doing wrong.

Here are the camera settings :