I recall notifications clearing on their own once they have been viewed on any of my devices connected to my iCloud account. Seems like this feature has disappeared. Every time I pick up my iPhone, I'd see lots of notifications for messages that I had read on my Mac. Likewise, even when the Messages app is active on my Mac (and while I am typing a response on it), I will still receive the notifications for the same messages on my Watch. Anyone has a fix for this issue?