Live Video pass through as background silently fails on ARFoundation over ARCore on Android when Graphics are set to OpenGLES2.0

1. What happened

The live video is replace by cyan on app startup. This was the only hint I got from the logs:

08-15 17:18:30.656 11594-11823/com.realar.viewer2 I/native: cameras.cc:739 Camera changed state from 2 to 3: Capture session started streaming.
08-15 17:18:30.724 11594-11639/com.realar.viewer2 D/Unity: WARNING: Shader
Unsupported: 'Unlit/ARCoreBackground' - Pass '' has no vertex shader
WARNING: Shader
Unsupported: 'Unlit/ARCoreBackground' - Setting to default shader.

2. How we can reproduce it using the example you attached

Any AR Foundation project targetting Android (and therefore using ARCore) with the player graphics set to OpenGLES2.0 will silently fail - OpenGLES3.0 is required. There should be a guard against this.