Yes, definitely I did so. 
I also repeated the whole procedure of deleting, readding and connecting without any change.
My current /e/OS version is 2.2 based on Android 13. The problem was definitely already there in version 2.1 but I cannot say whether it started when installing that version.
My feeling was that it started with DiscourseHub 2.0.0.
What I have forgotten to note is that I use dark mode (which I can’t change anymore because of the not working cog wheel button).
This is what it looks like. 12 new items in the Fairphone Community Forum is correct, for the /e/OS community currently 1 unread and 20 new items would be correct.