Iridescence in Standard shader is not recorded correctly with render from PV camera

Original issue: https://github.com/microsoft/MixedRealityToolkit-Unity/issues/9719

Describe the bug

When recording a video on HoloLens 2 with Render From PV Camera enabled the iridescence part of the MRTK Standard shader is not recorded correctly. When Render From PV Camera is disabled the recorded video is as expected.

Expected behavior

When recording with Render From PV Camera enabled I would like to see the same outcome in the recorded video as what a user sees in HoloLens.

Screenshots

Here's a demo in Unity and a recording afterwards (with Render From PV Camera enabled)
https://www.youtube.com/watch?v=3ustSanqxD0

Your setup (please complete the following information)

Unity Version 2019.4.20f
MRTK Version 2.7.0-preview.3

Target platform (please complete the following information)

• HoloLens 2

Additional context

n/a

まず、Render From PV Camera を有効にした HoloLens 2 上の Unity 2019.4.20f で録画を再現し、MRTK Standard shader のイリデッセンスに焦点を当てます。録画したビデオとユーザーの視界を比較し、PV-camera の出力を処理するレンダリングのエントリポイントを特定します。録画にイリデッセンスが正しく表示されれば完了です。