Zoho CRM Client Scripts - can't fetch detail of a recently added Lookup Field

Zoho CRM Client Scripts - can't fetch detail of a recently added Lookup Field

This is happening with a lookup field we added just yesterday. All other lookup fields are working fine. What could we have missed?

The following code is how we fetch the records.
  1. client_record = ZDK.Apps.CRM.Clients.fetchById(client_id);
But once that's done, we cannot access the lookup field we want. All other fields are appearing in the prompts.