Shader Not Working In iOS Build With Post-Processing

When the PP stack built into URP in 2019.3 is enabled in a scene a UI blur shader that I'm using does not render at all. The shader in question: https://assetstore.unity.com/packages/vfx/shaders/fullscreen-camera-effects/gaussianblur-lwrp-145889

The shader works correctly with PP in the Unity Editor's Play Mode, but when built to iOS any scenes that use PP cause the shader to not display at all.

 

@ShockpointGames did you find a solution to this? I'm having the exact same problem and can only get my shader to work if PP is disabled. It's very frustrating.