syncrepl debugging

Hello

I have some objects that are not propagated by syncrepl. How this should be debugged? Is there a way to force a sync?

Even if I stop slapd, rm /var/openldap/openldap-data/* and restart it, syncrepl will repopulate the databases, but I'll stil have some objects missing.

It's 2.3.38, and here is syncrepl config stuf: provider=ldap://ldap0.example.net type=refreshAndPersist searchbase="dc=example,dc=net" starttls=critical bindmethod=sasl saslmech=EXTERNAL schemachecking=off retry=3,1,10,2,60,+

One odd thing: The root entryCSN is newer on the replica than on the master. Can it explains the mess?