Repro steps:
1. Open the attached project "LightingTest.zip"
2. Build and Run on Quest
3. Attach the Frame Debugger
4. Observe 4 draw calls to for the cubes
5. Leave only one light in the scene and rebuild
6. Observe that there's only one instanced draw call

Actual result: Adding real-time lights to the scene leads to cube draw calls not being instanced anymore

Reproducible with: 2019.4.21f1 (URP 7.3.1), 2020.2.6f1 (URP 10.3.1), 2021.1.0b8 (URP 11.0.0), 2021.2.0a5 (URP 12.0.0)

Note: Found with Quest, but reproduces on Android without XR.