OP, I am experiencing the same issues and gave up trying to find a solution after loading a very early save, going through the entire Act 2 again, and getting the same result. Never expected this marvelous game become so upsetting to me.

Playthrough details:
- Dark Urge+Minthara duo (tactician)
- Every companion is permanently dead, except Shadowheart
- We skipped Créche Y'llek altogether because Minthara needed Thorm dealt with first
- Beat Thorm the intended way after clearing the rest of the Shadowcursed Lands
- Went through all cutscenes at camp before taking the road to Baldur's Gate, except Minthara's 2nd romance scene (if there even is one?)
- At Wyrm's Lookout, no cutscenes take place during long rest, no one has anything to say, can't rest again and can't leave camp
- Warped back to Act 2 to try again, every single enemy respawned
- Can't take the road to Baldur's Gate anymore

It's worth noting that reloading, verifying my install and reinstalling the game at any of these points changes nothing.

Hopefully Larian will look into this someday?