In LemonLDAP::NG before 2.0.15. some sessions are not deleted when they are supposed to be deleted according to the timeoutActivity setting. This can occur when there are at least two servers, and a session is manually removed before the time at which it would have been removed automatically.
https://lists.debian.org/debian-lts-announce/2023/01/msg00027.html
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.0.15
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/issues/2758
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/commit/59c781b393947663ad3bf26bad0581413dd6fae4