Some Examples are broken on Mobile WebGL

## Bevy version

I'm not sure, its whatever version of bevy the web examples are using at the time of writing this, if it tracks release then bevy 0.7

## Operating system & version

S22 Ultra, Android 12

## What you did

1. Open Chrome or FireFox on Android
2. Navigate to https://bevyengine.org/examples/3d/lighting/ or https://bevyengine.org/examples/3d/spherical-area-lights/
3. Wait for the scene to load

## What you expected to happen

The example scene renders without artifacts

## What actually happened

the scene rendered with artifacts

## Additional information

Any additional information you would like to add such as screenshots, logs, etc.