Notification - Clear All button goofing up - iPhone 11 - IOS 15.1

I am not impressed with the "Clear All" functionality of "Notification".

Sometimes it appears on a single notification and sometimes it's unavailable on multiple notifications.

Rarely it clears all the notifications, most of the time I am clearing by single ticking individual row of the Notification. "Waste of time".

Is anybody out there experiencing a similar issue?