Multi Instrument async looping doesn't work

Hello! I created this event. Every time it loops ,one of the audios in each Multi Instrument should play one time to the end. And it works perfectly.
But when I want to do another event like this, the Multi Instrument only plays a random audio once, then stops. Even if I copy an Instrument from that perfect event, still doesn’t loop! It only loops when I cancel the Async. But that way the audios won’t play in the way that one audio plays before another ends.
Is this a bug? Or I missed something?
The version is 2.02.04.

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I solved it by myself. It turns out the head of the instrument can’t be located as same as the begining of the loop region. I don’t know why but it works. Thanks anyway! :sparkling_heart: