I have faced this problem too in the earlier version of UE4.22 but not in the updated version. To fix it, I used to migrate my all levels in new project or copy paste new post process volume in my scene from previous projects.
I have faced this problem too in the earlier version of UE4.22 but not in the updated version. To fix it, I used to migrate my all levels in new project or copy paste new post process volume in my scene from previous projects.