Topic
When a SharePoint choice column is updated to add or remove choices a published New Responsive Form with an existing choice control connected to the column does not update.
Information
This is expected behavior.
The connected choice control is only updated in the form when the form is published. This is to ensure that the entries in the choice control are valid. If a choice is removed for instance it could make a rule invalid and therefore cause errors with the form.
If a choice column is updated in SharePoint the New Responsive for has to be published again so it is updated.