Wysiwyg Required Validation Not Working

Hi Guys,

the required validation not working with wysiwyg editor, it works only if i switched to the text tab, but with visual tab it is not working at all.

$meta_boxes[] = array(
    'id' => 'news_event_meta',
    'title'      => 'Events',
    'post_types' => 'news',
    'priority'   => 'high',
    'visible' => [ 'slug:tax_input[news-categories]', 'in', [ 'events' ] ],
    'fields' => array(
        array(
            'name' => 'Event Agenda ?',
            'id'   => 'event_agenda_check',
            'type' => 'checkbox',
            'std'  => 0, // 0 or 1
        ),
        array(
            'name'  => 'Agenda',
            'id'    => 'event_agenda',
            'type'  => 'wysiwyg',
            'raw'     => false,
            'visible' => array( 'event_agenda_check', true ),
            'required' => true,
        ),
    )
);

Thank you for you hard work.