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

A customer runs regular checks to compare the number of child entries under a specific node on several servers. This was done by requesting the numSubordinates attribute.
On the servers that are using LMDB, the value of numSubordinates is different of the actual value of direct entries.

What is the impact of this issue to you?

Monitoring reports are showing errors.

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

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

grep 389-ds <SOS_REPORT>/installed-rpms 
389-ds-base-2.6.1-6.el9_6.x86_64                            Sun May 25 15:39:51 2025
389-ds-base-libs-2.6.1-6.el9_6.x86_64                       Sun May 25 15:39:44 2025

How reproducible is this bug?:

Always at customer site.

Steps to reproduce

1. Install LDAP servers and create a replication topology
2. Convert 1 server to use LMDB
3. On the server using LMDB, compare the numSubordinates and the number of direct children.

ldapsearch -xLLL -D "cn=Directory Manager" -W -s one -b "cn=users,cn=accounts,dc=example,dc=com" "(|(objectClass=*)(objectclass=ldapsubentry))" 1.1 | grep -c "^dn"
Enter LDAP Password:
45265
ldapsearch -xLLL -D "cn=Directory Manager" -W -s base -b "cn=users,cn=accounts,dc=example,dc=com" "(objectClass=*)" 1.1 numSubordinates | grep numSubordinates
Enter LDAP Password:
numSubordinates: 45425

Expected results

Mismatching values.

Actual results

Values should be matching.