To reproduce:

1. Download attached project "Break My Routine.zip" and open in Unity
2. Open "Start Routine" scene
3. Enter to Play mode
Note: Observe that console says the coroutine completed and the application ended
4. Build the project and run it
Note: Observe that the game starts and ends and the output_log.txt shows the coroutine finished
5. Create a shortcut to your build and append -batchmode to the target path
6. Run the shortcut

Expected result: The game starts and ends and the output_log.txt shows the coroutine finished
Actual result: The executable never quits and output_log.txt doesn't show the coroutine finishing

Reproduced on Unity 5.6.1p1, 2017.1.0b7 and 2017.2.0a1
Not reproduced on Unity 5.6.1f1
Regression on Unity 5.6.1p1