Fog of War with Post process volume

Hi everyone, I have 2 issues that I cannot resolve:

  1. I have a fog of war as a plane object with material applied to it and revealed when the building spawn or pawn walks. But I also have an post process volume and occlusion mask on pawns and trees. Unfortunately fog of war doesn’t hide this and occlusion mask can be seen when I hover the mouse over the object, or if an enemy is hidden behind the building.


  2. The second issue with it is that the water spline is not hidden by the fog of war

What could be the issue in configuration or setup and where should I look for the answer?
Posting all blueprints is too much so I would rather upload them on request.
Fog of war tutorial is: https://www.youtube.com/watch?v=It_HmGaTTPU&t=1252s&ab_channel=RyanLaley
Occlusion mask is a combination of a lot of things so better on request, but in short, it is post process volume with stensil reveal.

Hope someone knows the answer.
Thanks