What were you trying to do that didn't work?

In an IPA context, a customer is using LMDB on a couple of LDAP servers.
On those servers, they are noticing a high number of replication error messages about "Can't locate CSN <CSN_VALUE> in the changelog (DB rc=-12797)".

For instance:

$ grep implement: dse.ldif
nsslapd-backend-implement: mdb
$
$ grep -ic "Can't locate CSN"  errors* | grep -v rotation
errors:323
errors.20260216-112905:2780
$ 

On the BDB server with the same replication data:

grep implement: dse.ldif
nsslapd-backend-implement: bdb

grep -ic "Can't locate CSN" errors* | grep -v rotation
errors:1
errors.20260210-180722:0

What is the impact of this issue to you?

Replication is working fine so the customer is curious to know why there are so many occurrences of the error message.

Please provide the package NVR for which the bug is seen:

cat etc/redhat-release 
Red Hat Enterprise Linux release 9.6 (Plow)

 grep 389-ds installed-rpms 
389-ds-base-2.6.1-12.el9_6.x86_64                           Thu Nov 20 14:27:39 2025
389-ds-base-libs-2.6.1-12.el9_6.x86_64                      Thu Nov 20 14:27:38 2025

How reproducible is this bug?:

Always on servers using LMDB.

Steps to reproduce

1. Install an IPA topology
2. Configure some LDAP servers to use LMDB
3. Check the errors logs

Expected results

Ideally no replication error message.

Actual results

High rate of replication error messages while replication seems to work fine.