Dom event properties not working

Hi!

I tried migrating to the new DOM Event method (instead of on_sent_ok). It works fine without the additional properties, but if I try your example

document.addEventListener( 'wpcf7submit', function( event ) {
    if ( '123' == event.detail.contactFormId ) {
        alert( "The contact form ID is 123." );
        // do something productive
    }
}, false );

(with relevant form ids) the contactFormId is undefined. Is this not completely implemented yet?

Cheers,
Andreas