Fomantic-UI Dropdown initialization settings

Investigating poss phantom onChange event firings in dropdown.

HTML

<script src="https://unpkg.com/fomantic-ui@%5E2.10.0-beta/dist/semantic.js"></script>
<link rel="stylesheet" href="https://unpkg.com/fomantic-ui@%5E2.10.0-beta/dist/semantic.css">
<div id="atk_layout_form" class="ui form">
    <div class="field">
        <div id="lookup_single" class="ui input">
            <div class="ui dropdown  search selection" style="width: 100%;">
                <input name="lookup_single" type="hidden" id="lookup_single_input">
                <i class="dropdown icon"></i>
                <input class="search" style="width: 100%;">
                <div class="default text"></div>
            </div>
        </div>
    </div>
</div>

CSS

body {
  padding: 2em;
}

JavaScript

let resp = {
    success: true,
    results: [
        {value: "d", name: "dTitle"},
        {value: "u", name: "uTitle"},
    ]
};
let jsUrl = 'data:application/json;charset=UTF-8;base64,' + btoa(JSON.stringify(resp));
let jsInitValues = [{value: 'd', name: 'iniTitle', selected: true}];

$('#lookup_single div.ui.dropdown').dropdown({
    apiSettings: {url: jsUrl},
    values: jsInitValues,
});