Why won't this form prompt the browser to offer to save password?

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I have the following form which is placed on the page through AJAX (jQuery AJAX if that helps):
        
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                <span>2020-12-18 15:09</span>
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<p>You can try "double-submit" technique.</p>

<p>In short: on first submit cancel it, but trigger it again after successful auth and do not cancel it.</p>

<p>More detailed:</p>

<p>You need to rewrite your form like this:</p>

<p><code>&lt;form id="loginForm" onSubmit="return App.Auth.login();" method="POST" action="/back-redirector"&gt;</code></p>

<p><code>/back-redirector</code> just redirects back to the same page or to the main page. I am redirecting back to the same page.</p>

<p>And your <code>App.Auth.login()</code> function must <code>return false</code> when it is called first time, and <code>return true</code> if the first call has resulted in successful login.</p>

<p>Like this:</p>

<pre><code>letTheLoginFormDoTheSubmit = false; 
// flag to show that login was successful 
// and we need to trigger password save prompt.

login: function() {
    if (letTheLoginFormDoTheSubmit) {
        return true;
    }
    // Do the login
    // Start ajax
    ajax(login, password, function() {
        // This function is called when AJAX has completed
        if (loginIsGood) {
            letTheLoginFormDoTheSubmit = true;
            loginForm.submit(); // trigger submit again
        });
    return false;
}
</code></pre>

<p>So what happens?</p>

<ol>
<li>When your login-function is called the first time it starts login sequence, and returns false to stop the usual form submit.</li>
<li>Login function receives data, and if login is good it saves it on browser side, raises the flag "all good, trigger password save prompt" and submits the form again.</li>
<li>But because flag is flying login-function does not do the login again it just lets the browser do form submit normally, and this triggers password save prompt.</li>
</ol>

<p>Form is being submitted to the URL that just redirects browser back, and does not do any work.</p>

<p>Some caveats:</p>

<ul>
<li>Page will be reloaded, so save your auth cookie somehow locally, or let the redirector know which is it, so redirector can include it in a redirect.</li>
<li>All form data may go through this second submit. To avoid this remove the relevant fields from the form, or remove the name attributes.</li>
<li>Redirector is needed on the server side.</li>
</ul>

<p>But in overall it is not a major change to the login process and should trigger password-save prompt in every browser.</p>
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                <label for="L_vercode" class="layui-form-label">验证码</label>
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                  <span style="color: #c00;"><img class="hand" src="https://www.e-learn.cn/qa/user/code.html" onclick="javascript:updatecode();" id="verifycode"><a class="changecode"  href="javascript:updatecode();">&nbsp;看不清?</a></span>
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                                  <div class="layui-form-item">
                    <input type="hidden" value="457594" id="ans_qid" name="qid">
   <input type="hidden" id="tokenkey" name="tokenkey" value=''/>
                <input type="hidden" value="Why won&#39;t this form prompt the browser to offer to save password?" id="ans_title" name="title"> 
             
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