This is an old bug with Karlach's act two scene getting overwritten by another scene instead of queued. This is what happened in one of my playthroughs, but the outcome was that neither act two nor act three romance scenes triggered, even though in all the dialogues the romance was ongoing.
So it sounds like they half-fixed it, where it is still buggy, but at least the scene happens.
Last edited by saeran; 09/03/24 07:19 AM.