Subscribing to a user produces push notifications for their replies
In Pleroma we have the ability to "subscribe" to a user to get notifications for all of their posts. You can do that by clicking the bell icon next to the Follow button so it looks like it is ringing:
I believe the intention is that we want notifications for the parent posts. Currently the behavior is that you receive push/webpush notifications for every post that user makes, including replies to their own threads and replies to other users. This is... a bit much, but also those posts never show up in your Notifications panel; only the original/parent posts that users makes shows up there.
I think we need to adjust the Subscribe logic to filter out any post that is a reply.