Repro steps:
1. Open attached project
2. Make sure Multiview is used
3. Make sure the shader used for Left Controller is Particles/Standard Unlit
4. Build and Run on Quest
5. Press the X on the left controller a few times
6. Change that shader to Unlit/Color and repeat steps 4-5
Actual: The right eye becomes black, flickers or gets stuck and renders a single frame when the shader is Particles/Standard Unlit
Reproducible with: 2019.4.6f1, 2020.1.1f1, 2020.2.0a20