The Framed mod provides 2 different versions of Chapter 6 and makes going to Candlekeep a possible side quest not involving the Iron Throne.
If Candlekeep is visited before the Iron Throne Building is investigated, Eltan will have a different task for the group to be done in Chapter 6.
To experience the new version, a work order will need to be obtained from Bentley (Friendly Arm Inn) or Scar (initial meeting only and only if PC admits to clearing the Nashkel mines) during Chapter 5.