Why event disappear during deduplication ?

By default our module handle the deduplication, by using the event_id

Information about deduplication

Facebook determine if events are identical based on their ID and name. So, for an event to be deduplicated.
Once your event fulfills both conditions, we keep the first one and remove the following one. If a server and browser event arrive at approximately the same time (within 15 seconds of each other), we favor the browser event.

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