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.
A request's own screen is the exception. Opening a request, and saving its sidebar, loads the page, because the reply box is WordPress's editor and only a page load starts it.
Still stuck? Ask the developers who wrote it. We aim to reply within one business day.
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