How to render a Layer without the Volume Mask

Hello guys, my scene uses a HDRP Rendering and PostProcess Profiles. And I would like to apply this effect ONLY in the environtment and not the actual interactable object (weapon).

.

System works as following with two cameras:

• Main Camera Culling Mask renders the environmetn

• Main Camera Volume Layer Mask applied to environment

• CameraWeaponRender Backgroud Type set to None (I remember back in the day there was a clear only Background Type, but thats not there anymore)

• CameraWeaponRender Culling Mask renders the interactable object

• CameraWeaponRender Volume Layer Mask applied to Nothing (to IO gives same result)

• CameraWeaponRender Output Depth to 0 (so renders ontop of Main Camera)

.

This works as intended, CameraWeaponRender does not render any Volume and Main Camera renders the backgound, BUT CameraWeaponRender Volume applies on layers that are not set on the Culling mask, so the actual background of the camera (environment) has as well any Volume being applied (even tho this camera is rendering no background by its own).

.

Here you can see what is up (I modified the viewport of the CameraWeaponRender so you can see both cameras in action).

.

This is how it looks with Main Camera disabled (And the None Background Type)

.

Does someone know why this happen and how could I solve it? I would really preciate some help, its driving me insane those last days. Thanks for reading.

Unity version: 2019.2f.6f1