In Episode 22, where you visit three villages to get them to join you, one of them asks you to destroy a nomad camp. The camp has one white tent with several enemy cars to the left. It's required that you approach at least one enemy car, hostile it may be, with Jane or maybe Brad. This triggers a dialogue before the fighting continues. If you destroy all enemy cars in the camp, say by ranged fire, before the dialogue triggers, the quest will bug out. You won't be able to finish it or finish the mission.