Contact merge does not move audit log entries to the surviving contact

Mautic Series

7.1.x series

Mautic installed version

7.1

Way of installing

I downloaded a release from https://www.mautic.org/mautic-releases

PHP version

8.3

What browsers are you seeing the problem on?

No response

What happened?

When two contacts are merged, some contact-related records are reassigned from the losing contact to the surviving contact, but audit_log entries are not updated. As a result, the surviving contact’s audit log is incomplete after the merge, while historical audit entries remain attached to the deleted/losing contact ID.

Expected behavior

After merging contact A into contact B, all audit log entries for contact A should be reassigned to contact B, so the surviving contact shows the full combined audit history.

Actual behavior

Only some related records are moved during merge. Audit log rows with:

bundle = 'lead' object = 'lead' object_id = remain linked to the losing contact ID and are no longer visible on the surviving contact’s audit log tab.

Impact

Users lose visibility into historical contact changes after a merge. This makes merged contact records harder to audit and can hide important history such as field updates, identification events, IP additions, and other contact changes.

How can we reproduce this issue?

Step 1: Create a contact A Step 2: Edit it Step 3: See the audit log Step 4: Create a form Step 5: Fill out the form with the email address of contact A Step 6: After submitting, check that the leads got merged and that the Audit log of A is gone (your edit from step2), but the history is still there

Relevant log output

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