Same thing for me, bugs out at the second research team and they won’t follow me south out of the cave with Trahearne. All 3 times I’ve done this no one but Trahearne will follow me after the dialogue with the second team, then the next step will not trigger because the research teams you’re escorting are not with you and neither are the 3 order’s representatives.
I also just noticed that one of the first team’s group never made it out of their camp. Krew Apprentice Pekk was still standing in the camp that gets sieged by undead when it bugged. I don’t know if that’s important or not…