In brief: A second fire on a CustomEvent only triggers the first subscriber. All others are only called on first fire.
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I have an link that fires with Y.on('click') an Y.Global.fire('form:submit'); CustomEvent

Other parts of my code set several subscribers, e.g.
a.) Y.Global.on('form:submit', functionA);
b.) Y.Global.on('form:submit', functionB);

functionA and functionB check if they are responsible and prevent propagation by returning false - or let others handle the event:


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The problem:
If the event ist first fired, everything is fine. functionA is called, it ignores the call (is not responsible check) and functionB gets the call and works with it and returns false to stop propagation.
If the same event is then later again fired (same code), only functionA is called, it again ignores the call, but functionB never sees this and any further events.

Reason:
On the second fire, the CustomEvent instance still has both subscribers correctly (I checked this), but it has a property this.stopped = 2 still set. That is the difference to the first fire. It results in event-custom-debug.js L809 to stop the iteration over all subscribers, because on the first fire of event it was set in L807 due to the returnvalue FALSE of my functionB handling the event and preventing further propagation.

Question:
Do I need to "reset" CustomEvents status myself ? I thought they are stateless after all subscribers have been called?

I expect this to be a bug or I misunderstood the concept of CustomEvents.
Thank you in advance for your help.