Shaders passes change order randomly for instantiated material

To Reproduce:
1. Open the attached project & scene.
2. Enter and exit play mode a few times (>5).
3. Notice that the light rendering changes in some cases.
4. Open the PointLightRenderer.cs script
5. Change the line commented in Start () for the one _not_ commented (//Works)
6. Test again entering and exiting play mode. The problem does not reproduce. The difference is that one material is instantiated (bug) and the other one is referenced (works).