UML14 — Question about InterruptibleActivityRegion

I am not sure about the semantics of the InterruptibleActivityRegion.

If I have such a region with an Accept Event Action to wait for an
event to terminate the region, what happens if there is no token
flow within the region, but the event occurs?

I think the Accept Event Action is active. I did not found another
statement in the specification. That means that all outgoing
egdes get tokens after event occurence.

Normally that is not the semantic the modeler wants. Nothing should happen
if there is no token flow in the activity region.

see above