Spectator camera doesn't work well with URP material

[CHRISLAUSC]

Describe the bug The camera of spectator view appear in the oculus device after convert the pink material to URP.

To Reproduce Steps to reproduce the behavior:

1. Open a new unity project with 3D URP scene.
2. Then import all the WEBXR stuffs from OpenURM.
3. Build and Run.

Expected behavior It seems like you've encountered an issue while building a desert scene in 3D using Universal Render Pipeline (URP) for VR. When you created a simple 3D scene with standard materials, it worked fine. However, when attempting to create a desert scene with URP, the spectator view appear inside in the Oculus device not in the browser.

Screenshots If applicable, add screenshots to help explain your problem.

Spectator camera Settings with URP

Spectator camera Settings with Standard Material (Working)

Unity info (please complete the following information):

• Editor version: Unity 2021.3.18f
• WebXR package version: 0.161
• WebXR Interactions version: 0.163
• Git or OpenUPM: OpenURM

Desktop (please complete the following information):

• OS + Version: [e.g. Windows 10] Window 11
• Browser: [e.g. Chrome 104] Tested on both Edge and Chrome

Headset (please complete the following information):

• Device: [e.g. Meta Quest 1] Meta Quest Pro
• OS: [e.g. Meta Quest build 55.0] Build 55

Additional context Add any other context about the problem here.

[De-Panther]

Fixed now that we moved to URP only. Apparently the URP uses another method for pre rendering, so instead of OnPreRender() was needed to register to RenderPipelineManager.beginCameraRendering.

Fixed in versions 0.20.0.