Steps to reproduce:
1.Open attached ’SpeedMultiplierTransition' Unity project
2.Open scene ’Scene’
3.Enter Play mode
4.Hold left mouse button for 1 or more seconds and release

Expected results:
Animation transitions back to the default state
Actual results:
Animation ignores the transition to the default state

Reproduced in: 2017.3.0a4, 2017.2.0b7, 2017.1.0p3, 2017.1.0f3, 5.6.3f1, 5.5.4p2