I don’t think I can. It is happening from the topic list with topics that users have been reading. I haven’t visited recently enough to have a partially read topic in the list here or on the try sandbox that I can immediately click on.
EDIT: I visited a topic up until about midway ("Configuring Facebook login for Discourse, post 29). I then closed the browser and returned to meta’s latest section and clicked on the topic to resume reading. Sure enough, it directed me to post 30 in that thread. So it’s not reproducing here, at least in a short-term test in the manner I just performed in the matter of a minute.