Comments Notifications: I recently commented on this post. Earlier whenever I used to comment on a post and get a reply from OP just after my comment even without mentioning my name, I used to get notifications, but since some days I am not getting more than 2 comment notifications. I use Stack Exchange app on my Android which sends me all notifications and website on Firefox, neither of them received a notification regarding the same.
Badge Notifications: I recently edited a tag due to which I earned Tag Editor badge a few hours ago. Earlier I used to get the notifications regarding badges but now no notification is there.
I believe that above are due to recent changes in the website and consider it as a bug.