I added a note to a thread I started. Then edited. Then of course, the forum app has major problems, if you edit your note (no fancy … just text, no references, images, etc … zippo).
Anyway, it's solution was to delete the whole thread .. not just the final post. By the time I realized the app was back to its evil ways, I hadn't screen-copied the fake-error message (document the the app's problems).
Unlike the older forum which sort of documented solutions/workarounds/discussions, the new is at best, basically just a comment collection site. Which is fine.