I found out that fi I talk to Jaheira while controlling Halsin, Jaheira talks to me as if I'm meeting her in Last Light Inn instead of the end of Act 3 I'm on.
I don't think that's the only instance this is happening. I've had plenty of conversations where dialogues that wasn't relevant or even directed at the right person popped up. For one, I talked to Astarion after finishing Shadowheart's quest, and he talked to me as if I was Shadowheart and we were still in ACT 2. Talking to Shadowheart at this point did not mention anything about the end of her personal quest, and she was just talking to me about flowers and having the same lines as she'd had earlier in ACT 3.
Gale keps talking about things in ACT 2 also and only has dialogue options that relates to things that happened then that are completely irrelevant, and they don't go away if I click on them either. And if you go around talking to people as other people, it still ends up being Tav in the dialogue, but what they say is directed at the companion I chose, but the subtitles are directed at Tav. Companions doesn't acknowledge things that happens around them and Jaheira's still has options to talk about the whereabouts of Minsc despite him standing there beside her.
So, basically, ACT 3 is broken in a lot of ways still. Which is unfortunate.
