“On the Edge” still bugged

I’ve been playing the game up til the mission in SIRCAA with no major bugs whatsoever until I reached the mission in Zalissiya involving Monolith. All the NPCs and enemies are inside of the town hall and can’t shoot each other, and I can’t shoot them either. Talking to Gaffer provides no dialogue but advances the quest, but then from there I get stuck. Anyone know any fixes?