hello –
apparently autocompete=”off” does not work as expected anymore, as several forums indicate.
And when using ComboBox with autocomplete, the “change” event is triggered successfully but the autocompleted value is not available, so it appears as an empty input field.
workaround:  (set placeholder equal to “example” or come up with a better way to identify it)

document.querySelector('[aria-label="example"],[autocomplete="off"]').autocomplete=Math.random().toString();