I have an already deployed SharePoint hosted add-in, with a list and a custom newform.aspx for this list. Since a couple of days, I have noticed (like many others on this forum, like this thread) that my newform FormField controls are not rendering anymore.
<SharePoint:FormField runat="server" FieldName="Year" ControlMode="New" />
The contents of the controls, when looked at with developer tools render out in HTML like this (and show nothing but an empty span):
<span id="WPQ1371ef45e-dd3d-4d81-b57e-1de7f8b74fc7Year" data-sp-control="SPFieldChoice" data-sp-options="{"mode":3,"source":"Year"}"></span>
Could someone please clarfiy this, as I think this has something to do with a changes in the functionality of SPO. My add-in is not working at the moment, and it has worked fine for over a year.
Regards
Roel