materials are corrupt in BiRP in VR

[HawkenKing]

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Describe the bug When loading the BiRP version of the desert on headset, the materials are missing when entering VR.

To Reproduce Steps to reproduce the behavior:

1. Make a new project using 2D Core template.
2. Import unity-webxr-export via add from git url.
3. Import samples via add from git url.
4. Import BiRP desert sample.
5. export scene for web using webxr2020 template.
6. visit project in VR headset browser
7. click VR

Expected behavior materials visible as usual.

Unity info (please complete the following information):

• Editor version: 2022.3.50f1
• WebXR package version: 0.22.0
• WebXR Interactions version: 0.22.0
• Git or OpenUPM: Git
• Built-in render pipeline or URP: BiRP