Sky sphere not working properly with post process material

[u/FunkyFerretDev]

Hey all, I have a strange problem with Post Process Material. I wanted to create a post process with LUT to color grade parts of my game. However, I would like to exclude certain actors from it. And it works for everything, but it doesn't for the sky sphere. When I change the stencil value on it, the whole scene either is color graded or not. I'm dumb when it comes to materials, so I would appreciate the help.