It appears there is an accidental backwards incompatibility with 2.4 where slapd doesn't honor alias names with structural objectClasses. This would be good to fix for 2.5.7 so that it doesn't impact people upgrading from 2.4. It could also cause issues with slapcat of a 2.4 config database with 2.5 slapcat unnecessarily.
--Quanah
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Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: http://www.symas.com