I'm not sure the fields you are looking for even exist. I looked at the Member object documentation: Jive REST API v3.14 → Member entity and did not see the "updated" or "published" fields at the root level. The fields exist within the context of the nested group object but not at the member object level.
Can you clarify what values or information you are trying to obtain?
It looks like the fields are not being populated in most cases. The field could be present and populated with data but are not. I would need to do more testing.