I noticed that when clicking on a notification, only that one gets removed when viewing the post thread. Even if there are more notifications of the same thread in the list. I started following a thread (AP) wiht ton of posts and today woke up to 350 notifications listed of one thread. Clicking on one of them just marks that one as read. In result I wasn't able to easily see what other notifications I had cause they were mixed with that AP thread so just Marked them all as read.
Shouldn't notifications be marked as read the moment you enter the thread? I am quite sure this was the case before HQ app. Perhaps I am missing an option?