Can key objects in non-active scenes (multiscene) but the animator reference is lost when entering play mode (destructive)

This is known behaviour as this throws a warning message but this is really bad UX

2. How we can reproduce it using the example you attached

1) Open attached project and scene Test
2) Add scene New Scene
3) Add animation track for any object in New Scene to Timeline on Main Camera in scene Test
4) Enter play mode and notice reference is lost (and warning message in console)

Reproducible in 2017.1.0b1