I noticed an achievement I never saw before related to River District (something about throwing a balloon) and so I went to replay it. As usual, went to Neverember to get the RD replay quest, which lead me to River District. However, once I get there, the quest path tells me to Go to River District.
Either the quest waypoint is messed up and entering the RD instance doesn't progress the quest correctly OR there's supposed to be a different map icon specifically for this quest and it's not showing up on the travel map.
Regardless, it appears impossible to run the Chapter 1 replay.