I have been experiencing missing alerts for this thread.
All of the other threads I am subscribed to are behaving as usual; When I say "as usual" I mean "as they have been behaving for the past few months," which is not how they behaved prior to that.
Prior to a few months ago, I would get an alert for every single reply to any thread I was subscribed to, every single time time someone replied to it.
For the past few months however, I only get one notification if there was a reply since my last visit to that particular thread, and a "there may be more replies after this..."
So, if I log in and I have 10 alerts but only time to view two of them, I "lose" the other eight.
Meaning, later in the day when I log in, if I did not act upon my alerts earlier and visit the threads which had new replies, I will no longer receive alerts for those threads.
I'm effectively "unsubscribed" by default to threads which I did not have time to investigate the alert.
It's as if the forum SW decides that since I didn't follow up on one alert, I must not be that interested in the thread any more, and makes an executive decision not to waste my time with it again.
I do not like this. I wish it was as it used to be, where I might get 10 alerts piled up for a single thread, for 10 different replies, no matter whether I viewed them or not.