On iOS 16.4 Seed 1, NotificationEventEnabled is true, but NotificationsEnabled is false. This means, somewhat surprisingly, you can’t check Notification exists, yet you can get a Notification object from a NotificationEvent object.
<rdar://problem/105697554>
Pull request: https://github.com/WebKit/WebKit/pull/10410
Committed 260685@main (b8064a7a1a7b): <https://commits.webkit.org/260685@main> Reviewed commits have been landed. Closing PR #10410 and removing active labels.