ownerNav is empty during WfRequestStep Query - Successfactors ODATA API

Hello Experts,

I have a query in WfRequest entity and I want to retrieve the owners details for each step. I was able to achieve that in the past with the same query, however, some time ago it started to return the ownerNav as null. To just a few registers it returns correctly.

It happens for approvers types "ROLE" and "DYNAMIC_GROUP".

I'm using admin user as well, which it doesn't seem a permission issue. I could confirm this same behavior for many environments and different data centers.

API Query: https://api2preview.sapsf.eu/odata/v2/WfRequest?&$top=50&$expand=wfRequestStepNav,wfRequestStepNav/ownerNav&$format=json

Any idea what it might be?

Thanks in advance,