Great, I encountered a quest breaking bug in Diablo 4. That is present since release and was supposedly fixed.
I must say, even outside of my current annoyance and astonishment at the longevity of this issue, that Diablo 4 is in a surprisingly buggy state. Generally nothing horrible, and things that I chalk on the servers, like having to re-click a dialog a second time for it to register, but still. Meh.
Surprisingly, or not, and most assuredly not great optic, it seems that the bug is also linked to the internet connection. The possible solution may be to, I shit you not, use a github app to worsen your connection.