How to reproduce:

1. Open attached project (35509 statemachinebehaviour.zip)
- Make sure that the Strip Engine Code option in the Player Settings is enabled
2. Build to iOS and run
- A cube should appear and a console message of "Enter" should be printed
- This does not happen, instead nothing happens at all and no errors or other kinds of messages are printed
- Reproduced in Version 5.3.1f1 (3b3e8231502f),Version 5.3.1p2 (49544457ab1d)
- Not reproducible in Version 5.2.4f1 (98095704e6fe), Version 5.4.0b1 (3137382c8e08)
- A workaround is to not use the Strip Engine Code option for the time being