They changed the way scripted effects and turn-based mode interacted: https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=821275#Post821275

I eventually parked all other characters in camp, equipped my MC with Crusher's Ring and Longstrider, and rescued both the councilor and Benryn with one character in turn-based mode. With only one character in-scene, the scripted effects do one step at a time like they are supposed to.