Refresh prevention prevents resubmitting a form after errors when client side validation is disabled

If you have a form with client side validation disabled and submit the form with errors, you cannot correct the errors and resubmit the form. An error is returned with "Form has already been submitted".

Reproduce the problem with client-side validation disabled, then inspect the form submission and refresh-prevention flow. Done means that after correcting server-returned errors, the same form can be submitted again without the “Form has already been submitted” error. The issue names no file or test to run.

Written by the indexing model from the issue text.