Mecanim - animation events now trigger twice in 5.2.1

After upgrading to 5.2.1 Animation events now trigger twice. In my case it results in double fireballs.

First time - when clip plays, and second time - when it is transitioning away.

That was not the case with previous version.

Is there any sane workaround for that? I'd like to have old behavior.

I'll need to downgrade back to 5.1.3 if there's no workaround.

 

https://fogbugz.unity3d.com/default.asp?730182_pdnmpnepleia9l6k

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I downgraded back to 5.1.3.

There were a LOT of animation events in my controller and dealing checking them all for this issue was not an option.