The User wrote code that assigns a new Sprite to the m_Sprites[] of each Rule on a RuleTile. The purpose is to dynamically skin a TileMap at runtime, by using a different Sprite atlas that contains the same named sprites as the source atlas used in the RuleTile. The codes work as expected in the Editor, and it works on Android builds using Mono, but produces Exceptions when building to Android with IL2CPP

To reproduce:

1. Download project from the attached link and open in Unity
2. Change Scripting Backend to Mono
3. Run logcat
4. Build and Run the project on an Android device
5. Start a game and play a bit
6. Observe logcat and see that everything works fine
7. Exit APK
8. Change Scripting Backend to IL2CPP
9. Run logcat
10. Build and Run the project on an Android device
11. Start a game and play a bit
12. Observe logcat and see that there are a lot of NullReferenceExceptions

Notes:
- The exceptions and logcats are shared in the comments section

Devices:
- Google Pixel 2, OS: 8.1.0, CPU: arm64-v8a, GPU: Adreno (TM) 540
- Samsung Galaxy Note 8, OS: 7.1.1, CPU: arm64-v8a, GPU: Adreno (TM) 540

Reproduced on Unity 2017.2.0f3, 2017.2.2p1 and 2017.3.1p3
Could not check for regression and is this is fixed because in Unity 2017.1, 2018.1 and 2018.2 Shaders becomes broken