Replication in mirror mode is configured for OpenLDAP server (slapd) configuration database (cn=config). Replication configuration (olcSyncrepl) is changed.
The cn=config database is silently removed from mirror mode and it cannot be longer modified without restarting the slapd daemon.
Upstream patch applied to fix correctly handle the changes of replication configuration.
Change of replication configuration preservers the state of mirror mode correctly, cn=config database can be modified with no need to restart the slapd daemon.