Post Process Shader Not Work with SteamVR

Unity Engine
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1

Hi, I am working on applying a post process shader (a mask) on VR content (steamvr + Neo3). The script works perfectly fine with non-VR games. However, when I enabled steamvr camera and applied shader script, the scene is missing and only the mask is left.
I have attached a few screenshots below. Does anyone know how to solve this problem? Thanks.

This is the intended game view. Basically I am tyring to mask out peripheral areas:

8122073--1052780--upload_2022-5-12_18-58-58.png
8122073--1052780--upload_2022-5-12_18-58-58.png615×552 23.6 KB

This is the game view when I enabled steamvr camera, only the mask is left:
8122073--1052786--upload_2022-5-12_19-1-45.png
8122073--1052786--upload_2022-5-12_19-1-45.png1114×956 81.1 KB

Below are my shader scripts:
8122073--1052789--upload_2022-5-12_19-5-7.png
8122073--1052789--upload_2022-5-12_19-5-7.png861×768 38 KB

8122073--1052792--upload_2022-5-12_19-6-40.png
8122073--1052792--upload_2022-5-12_19-6-40.png763×879 39.1 KB

8122073--1052780--upload_2022-5-12_18-58-58.png
8122073--1052780--upload_2022-5-12_18-58-58.png615×552 23.6 KB

2

Your shader would at least need to be modified to support Single Pass Instanced VR rendering. The steps for this are outlined in the manual here.