title: ionChange event doesn't work on ion-select
body: <p>I want to execute a codeblock every time the value of my <code>ion-select</code> changes.<br />
  The documentation provides an <code>ionChange</code> event for that.<br />
  When I try to execute it, nothing happens.<br />
  I tried <code>ionFocus</code> and it works but i need the <code>ionChange</code> event to work.</p>
  <pre><code>&lt;ion-select @ionChange=&quot;changeUnit('ionChange')&quot; @ionFocus=&quot;changeUnit('ionFocus')&quot; interface=&quot;popover&quot; placeholder=&quot;required&quot;&gt;
      &lt;ion-select-option value=&quot;m3&quot;&gt;m3&lt;/ion-select-option&gt;
      &lt;ion-select-option value=&quot;m2&quot;&gt;m2&lt;/ion-select-option&gt;
      &lt;ion-select-option value=&quot;ml&quot;&gt;ml&lt;/ion-select-option&gt;
      &lt;ion-select-option value=&quot;kg&quot;&gt;kg&lt;/ion-select-option&gt;
  &lt;/ion-select&gt;
  
  changeUnit(value){
      console.log(value);
  }
  </code></pre>
  <p>Do I miss something? Why does the <code>ionFocus</code> work but the <code>ionChange</code> not?</p>
  <p>I'm using ionic 5 and vue 3.</p>
  <p>I also use an emitter from <code>mitt</code> in the same component.
  But this also doesn't interfere with the <code>ionFocus</code> event.</p>