Created a new Kbin “Thread” in a #Guppe group (or Kbin “Magazine”)
The new Kbin Thread was received by Guppe and pushed to its members.
Using a Kbin account, I replied to that Kbin Thread.
The reply was not seen by Guppe and thus no post/reply was pushed.
Using a non-Kbin account, I replied to that Kbin Thread.
Kbin itself received the reply and displays it as a Thread comment.
Using a Kbin account, I replied to the non-Kbin reply (see #3).
Guppe received it and the reply was pushed to Guppe members.
So… it seems that a Kbin account replying to a Kbin Thread is not being received by Guppe (or Kbin is not pushing it).
Note: I have not tested if the Kbin “Magazine” is not from another instance. The steps would be slightly different as the non-Kbin account first have to subscribe/follo that “Magazine“.
The “Ooh, I'm starting to” and “So, this is probably a” replies were from my Kbin account and were not seen by Guppe (thus can only be seen from Kbin itself).