QtWebengine view can not get value when TOUCH on a html select droplist option

I created a app using the qtwebengineview to display a html page which has a select element, and my device has a touch screen, when i click the select options by mouse, it works good, but when i touched on the select droplist window, it seems the event is not handled correctly, i have to touch one or more times to select another option, and the value of the select element  is not changed, the droplist window is still exists unless i touch another app window.

The html select code:

<select>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select>