no contextCSN attribute on consumers

Hi,

We have a 4-machine setup with two providers (replicating between each other) and two consumers (for client access) that both replicate from both providers, type=refreshAndPersist

I'm trying to write a script to monitor replication, using the contextCSN attribute.

ldapsearch on the providers gives the expected the contextCSN attributes: contextCSN: 20230612115901.693614Z#000000#001#000000 contextCSN: 20230612115904.937471Z#000000#002#000000

However, the same ldapsearch on the consumers gives *no* contextCSN attributes *at all*. But when using slapcat to check directly on the consumers databases, we *can* see the attributes, and they are also up-to-date:

contextCSN: 20230612115801.572594Z#000000#001#000000 contextCSN: 20230612115804.594419Z#000000#002#000000

Is there any explanation, why I would be unable to obtain these contextCSN attributes through an ldapsearch?

This is RHEL7.9, with openldap 2.4.44

Thanks!