Post Process Input 0 masking Elements

Hey everyone!

I have this cheap and easy fog post process material:

but when I apply it through a post process volume the effect works but some elements, mainly fortnite elements or my custom blueprints, are being weirdly masked like this:

I am pretty shure it is because of the SceneDepth an these elements are on a different layer… Can someone please help me with fixing it?

Thank you really much for every help in advance!
Greetings!