COURSE_ENROLLMENT_CREATED signal fired twice for a single enrollment

Description

On a local tutor setup, enrolling one user into one course results in COURSE_ENROLLMENT_CREATED being emitted twice, each with a distinct event_metadata.id. This was observed via a downstream receiver (webhook forwarder) that logged two separate deliveries for what should be a single enrollment action:

Since the two events have different event_metadata.id values, this isn't a case of a receiver being connected twice (that would redeliver the same event id) — the event is being emitted twice by edx-platform itself for the same enrollment action.

Steps to reproduce

1. On a dev setup, enroll a single user in a single course (via UI or enrollment API).
2. Have a receiver connected to COURSE_ENROLLMENT_CREATED (e.g. logging the metadata.id of each call).
3. Observe two invocations with different event_metadata.id for the same enrollment.

Expected behavior

One enrollment action should emit exactly one COURSE_ENROLLMENT_CREATED event.

Actual behavior

Two events are emitted with distinct ids, seconds apart, for the same user/course enrollment.

Environment

• tutor 22.0.0 openedx verawood.1
• Open edX Events: openedx_events.learning.signals.COURSE_ENROLLMENT_CREATED

Reproduce the enrollment through the UI or enrollment API while logging event_metadata.id for COURSE_ENROLLMENT_CREATED. Trace the signal's emission paths in edx-platform and confirm completion when one enrollment action produces exactly one event with one distinct id.