It seems that we need remove this notification item in Vue if we are at subscribed thread page.
It may be caused by window.location.pathname is same, so the browser won't reload, so the notifications in Vue won't change.
That's wired that I found it works fine in your video.
https://github.com/laracasts/Lets-Build-a-Forum-in-Laravel/blob/713853deb83d108f6bfa167fbdfc44e244c57e18/resources/assets/js/components/UserNotifications.vue#L31
It seems that we need remove this notification item in Vue if we are at subscribed thread page. It may be caused by window.location.pathname is same, so the browser won't reload, so the notifications in Vue won't change. That's wired that I found it works fine in your video.