How to reproduce:
1. Open the attached “IN-147181.zip” project
2. Open the “Project Settings” window (Edit → Project Settings)
3. Select the “MockHMD” tab under the “XR Plug-in Management” section
4. Set the “Render Mode” to “Single Pass Instanced”
5. Build for iOS
6. Observe the device
Actual result: The left and right eyes render without the skybox and cube
Expected result: The skybox and cube are visible in both eyes
Reproducible with: 1.3.1-preview.1, 1.5.0-exp.3 (6000.0.79f1)
Could not test with: 1.3.0-preview.1 (6000.0.79f1) (The “Mock HMD Loader” plug-in provider isn't available under iOS settings)
Reproducible environment: macOS 26.5.2 (25F84) (M3 Max)
Not reproducible environment: No other environments tested
Note: Setting the “Render Mode” to “Single Pass Instanced” isn't supported on iOS, but according to the docs, it should fall back to “Multi-pass” mode https://docs.unity3d.com/Manual/SinglePassStereoRendering.html