https://bugs.openldap.org/show_bug.cgi?id=9269
--- Comment #1 from Howard Chu hyc@openldap.org --- (In reply to Konstantin Andreev from comment #0)
"hidden" configuration option is ignored by slapd (not honored by "glue" overlay?) if the database it tries to hide is also a "subordinate" database. Checked for openldap 2.4.47 and current git master (f3952d9).
What is the use case for this configuration? Certainly the "hidden" option was never meant to be used in a glued DB.