[iOS] Sounds stacks up and plays at once after alarm

I have many sounds that trigger regularly in my game (one by second). If the game is interrumped by the Alarm (on iOS) all the sounds stacks up and plays at once when after close the Alarm notification. This doesn't happen if I don't use MasterAudio and just call the Play method from an Audiosource.

In Android this doesn't happen because the game is not sound muted when the Alarm start to sound.