Defend_LW Game breaking Evac error

[AvengerXP]

EVAC zone spawned straight inside the middle of a vehicle. Middle square was in passenger seat, 3 squares only left to evac. Problem is, the evac zone disappears on the next turn entirely and is never recreated. The objective up top says "Defend the AO until Skyranger returns" but I didn't evac any civilians. The game is stuck in perpetual Reinforcement defense mode. Can't win.