The code for self:true in the members array of ReplSetGetStatus shows fewer fields than for remote hosts. Most of these are related to network (like pingMs) or remoteness (like the heartbeat fields), and so don't make sense to show for self. However, when running ReplSetGetStatus on a secondary, it still makes sense to see the syncingTo field, since the secondary is still syncing to some other member, and so it is confusing for the field to be absent. It is easy to miss the top-level syncingTo field when focussing on the status of the members.