Select is not expanded in IE 11

[Tazzzilo]

When using Internet Explorer 11 and clicking on the first selection field (Single select box) it will not get expanded:

https://metroui.org.ua/select.html

I've discovered the same with my own code which I am unable to test in codepen because they don't support IE 11 (for good reason).

The selects in react are working fine with IE 11 (https://react.metroui.org.ua/guide/select)

I could trace it back to that line:
<div class="drop-container" style="display: none;" data-role="dropdown" data-role-dropdown="true">
The display property probably gets an unsupported value when clicking on the selection area.
Because when removing display: none; the select is expanded