Custom ajax event not working on select widget

Problem/Motivation

I'm trying to add a custom ajax event to a field using the Tagify select widget, through a form alter of the node form:

$form['field_product_groups']['widget']['#ajax'] = [
    'event' => 'change',
    'callback' => [$this, 'updateSelects'],
    'wrapper' => $form['#id'],
    'disable-refocus' => true,
];

The ajax event is processed and present in drupalSettings.ajax object when I check this variable in the browser console, but when changing the selected value, no ajax callback is triggered. The same code does work when using the Tagify autocomplete widget. No errors are logged to the console.