Create a single-line textbox custom field with the following settings and with a maximum length of '32':
Try to register and type a larger number of characters into our test field (by increasing the maxLength of the form via firebug).
The form has vanished in the next error page.
The form should always be present and editable inside Registration, even if it set to be editable once.
If you go a page back in the history, the form is still editable.
This bug also exists when using custom callbacks to verify field values.