When I use HDRP , I have three cameras in the scene. Post process does not work properly unless i set the other two camera game objects to inactive.
I tried all sorts of layer changes , mask changes culling settings to no avail. This was not an issue when not using HDRP. The PP v2 works as it should with my cameras when using regular rendering.
Unity 2018.3.f2 Post process2.1.2. Windows 10 64 bit