Steps to reproduce:

1) Download attached project and open in Unity
2) Open 'MainScene' and press Play
3) In login screen, click on 'Continue as guest' button
If presented with a wheel that doesn't spin, Stop play mode and repeat steps 2-3
4) In Hierarchy window, expand 'lobby3d' scene and select GAMEOBJECT_NAME gameObject
5) In Inspector window, double click on 'LobbyAnimationGroup' Animator Controller
Animator window will open. Drag and drop this window somewhere, so you could see Game view and Animator window
6) In Game view, click on BUTTON_NAME button
7) Observe Animator window and you will see that state will reset to default 'LobbyStartIdle' instead of 'LobbyToNAMERewards'

Expected result: State should not be reset to default (check attached video 'noRepro.mp4')
Actual result: State resetting to default (check attached video 'repro.mp4')

Reproduced with:
5.6.0p1, 5.6.1p1, 2017.1.0b5

Not reproduced with:
5.5.3p3, 5.6.0f3

Regression from:
5.6.0p1