A screenshot would not adequately describe what is occurring any better than just writing about, due to the fact that there is nothing to capture really, its the cause effect sequence you'll have to tune your ears to......save doing a screen capture recording, which I could do but I kinda feel that's a pain.
Say I just start my phone. I know my subscribed threads have new posts because I checked on the PC. Phone will not display a notification....generally, until wrist twisters has been started at least once.
Or maybe the notifications work fine or only some of the time. Main issue is that when I tap on a notification for a thread having new posts, unless the app was very recently opened, and I have not "backed" all the way out of it till it closed, when you hit the notification, wrist twisters does not open, and take me to my first unread post in that thread.