Custom event `referrer` property in payload not overriding Plausible's internal referrer

[Pabl0cks]

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Issue is a Bug Report

• This is a bug report and not a feature request, nor asking for self-hosted support

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Plausible Cloud from plausible.io

Describe the bug

We are experiencing an issue where the referrer property, explicitly sent within the payload of our custom events via a direct call to Plausible's API, is not consistently used for attribution. This occurs even when we provide a specific referrer value, which is stored in our database (original referred from his first login).

Instead, Plausible's dashboard often displays the internal referrer you got from his active session (first pageview from that session), particularly for events happening within an active session managed by next-plausible.

Our setup involves:

1. Automatic Tracking: Using next-plausible for standard pageview tracking and other automatic events.
2. Custom Events: Sending specific custom events by directly calling the https://plausible.io/api/event endpoint from our server-side using a fetch request.

We are trying to do this because our Goals are usually happening hours or days after the first interaction with the page, so we want to track the original referrer as referrer for those events in Plausible.

As a workaround we are registering them now as Custom Properties, but finding some issue with that workaround too.

Expected behavior

We'd expect the referrer sent by our api call to override Plausible's internal referrer and the custom event to be linked with the referrer we are providing.

Screenshots

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