User/Group info shown as [object Object] in Web UI

Steps to reproduce:

• In Nuxeo Studio:
• Create a schema with a field called "AccountManager"
• Select "User/group" as data type of the field "AccountManager"
• Create a custom document type and associate our schema that includes the field "AccountManager"
• In View designer
• Create a custom view for our document type

               <div role="widget">
                   <label>Account Manager</label>
                  <div>[[document.properties.BARCustormerRequest:AccountManager]]</div>
               </div>
        

• In Nuxeo instance
• Deploy the changes in your Nuxeo instance
• Create a new document of our custom doc type
• Access the "View" screen of your custom document type.
• The value of the field "AccountManager" is shown as [object Object]

More details in private comment