How to reproduce:

1. Open attached project
2. Build to iOS and run on a Tablet device
3. Select one of the white squares next to the '=' symbol
4. Use the software keyboard to enter this symbol '^'
- This will create a gameobject with a TextMesh Pro component and an empty textbox
- Note that when this object is created the shadows for the round buttons above the equation disappear
- Adding more '^' symbols makes the shadows shift and warp around the buttons

- Reproduced in Version 5.4.0b11 (323b0238353b), Version 5.3.4p1 (e89f89413a91), Version 5.2.4f1 (98095704e6fe) on an iPadMini 4 (iOS 9.3)
- Reproducible both on Metal and OpenGL
- Also reproducible on Android