https://bugs.openldap.org/show_bug.cgi?id=8524

--- Comment #3 from Ondřej Kuzník ondra@mistotebe.net --- Just like with attribute and objectclass definitions, these are stored under cn=schema,cn=config as the file that defined them or directly in cn=config if defined in slapd.conf directly (as you're doing here). Maybe keep them in a file that you also include.

Don't know if we should document this behaviour or change it in some way.