To reproduce:
1) Open attached project and "test" scene
2) Play on Editor and press "issue repro" button.

Expected: Animation event is triggered twice ( sound is played twice)
Actual: Animation event is triggered once ( sound is played once)

During the transition, Animator.Play/CrossFade doesn't trigger animationClip's event at 0F.
If animationClip's event is located after 1F, the event will be executed.