Incident Deduplication

Hey Everyone!
I’ve got a quick question regarding incident deduplication.

I’ve set up event rules which receive events from datadog & set a dedup key in order to avoid incident duplications.
In rare cases the incident should also be triggered manually.
What my concern is, if an incident is triggered manually & after a while an event is sent to the rule, would I have two separate incidents? How should I avoid this?

Thanks in advance!