Good evening!
After I have killed the Red Cap Boooal, I start the next conversation with Pooldrip the Zealous, where they are making me their new god. Once I get to my first choice of dialogue, I make my selection, but instead of choosing it, I get the number flag to the right of the options with my username - which I believe indicates my choice to others when playing in multiplayer. (I haven't tried out the multiplayer yet, so I can only assume that this is what happens, but it seems logical.)
I have duplicated multiple times, just to make sure that it wasn't a one-off. And the conversation does not progress.
The image of the dialogue and multiplayer indication can be found here:
Convo Bug Screenshot