User sync fails because the system attempts to archive an active user account

Steps to reproduce

1. Connect Bitbucket Server to 2 user directories.
2. In directory 1, add a user bob
3. In directory 2, add a user fred
4. In directory 1, rename user bob to fred

Expected outcome

User bob should now be fred everywhere, and the old user fred should become an 'archived' user (so probably displays as fred_archive_1 or something like that)

Actual outcome

ERROR [clusterScheduler_Worker-2] c.a.c.d.DbCachingRemoteDirectory Incremental synchronization for directory [ 3014657 ] was unexpectedly interrupted, falling back to a full synchronisation
java.lang.IllegalArgumentException: Only deleted users can be archived

It then tries to do a full synchronization, but fails with a similar error:

ERROR [clusterScheduler_Worker-2] c.a.c.d.DbCachingDirectoryPoller Error occurred while refreshing the cache for directory [ 3014657 ].
java.lang.IllegalArgumentException: Only deleted users can be archived

Workaround

1. Connect Bitbucket Server to 2 user directories.
2. In directory 1, add a user bob
3. In directory 2, add a user fred
4. Temporarily disable directory 2
5. In directory 1, rename user bob to fred
6. Sync directory 1
7. Re-enable directory 2.