Because it does not need to. The plugin sends the form, gets the answer, and updates the screen where you are standing — the same handler runs on the server and the same checks are made, but you are not sent back to the top of a freshly-rendered page to find out whether it worked.
If anything goes wrong with that, the browser falls back to submitting the form the ordinary way, so nothing is ever stuck.
Still stuck? Ask the developers who wrote it. We aim to reply within one business day.
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