At a level 8 replication log, the DN is always shown as (null) which makes understanding the prior entries about the replication values very difficult. It turns out to be a talloc_move() sideeffect.
This bug was referenced in samba master: 17359afa627a3086ec8d6862f007a3479574a8b4
This bug was referenced in samba v4-19-test: 7310afa34df397736c900aed04996f84b752dd1f
This bug was referenced in samba v4-19-stable (Release samba-4.19.0rc3): 7310afa34df397736c900aed04996f84b752dd1f
This bug was referenced in samba v4-17-test: 4ae4d2ac3b3dc139923143ead82353d8183dfe06
This bug was referenced in samba v4-18-test: 50bba4925e0cd47fd0419c242e66ff9220d1ae7a
This bug was referenced in samba v4-17-stable (Release samba-4.17.11): 4ae4d2ac3b3dc139923143ead82353d8183dfe06
This bug was referenced in samba v4-18-stable (Release samba-4.18.7): 50bba4925e0cd47fd0419c242e66ff9220d1ae7a