https://bugs.openldap.org/show_bug.cgi?id=9888
--- Comment #6 from Michael Ströder michael@stroeder.com --- (In reply to Comment #5 from Quanah Gibson-Mount quanah@openldap.org)
(In reply to Howard Chu from comment #4) Also note that the OID is part of the index key, so reusing OIDs for different attributes will absolutely corrupt indices.
Hm, that's odd. One of my first conversations with you back at Stanford was when we hit an issue with AD that it stores knowledge of the attribute OIDs and OpenLDAP does not (back with OpenLDAP 2.1).
AFAICT this changed with back-mdb.