If I submit an FEF with a field that fails validation it returns w/the form and the error message. But, it also displays the “Message:” header text as well.
Also, there doesn’t seem to be an obvious way of intercepting the form submission to employ some logic for navigation afterwards–eg depending on it succeeding redirect it somewhere based on the data submitted (eg if it’s a cpt submit, go view that cpt w/it’s ID)