the event 'notificationclose' does not fire when user closes a web push notification from notification center


To replicate:
- add the code below to service worker
- push a notification
- use web inspector on the service worker, with breakpoints for debugger enabled
- click the X for the notification

self.addEventListener('notificationclose', function (event) {
debugger;
})

expected outcome:
Safari Web Inspector pauses at the debugger line above

Actual outcome:
The event is never triggered