[V5.1 - Ground Combat] Invisible aliens

[Emily_F]

Just a quick one to report that on some missions, during alien activity stuff will happen (mainly overwatch by my troops) an alien will be present but be invisible. Even after it dies, the only evidence it was ever there was the blood stains. Also, the drones disappear after dying. 

[Chris]

Thanks. Next time this happens, please save the game and provide us the save - it's kinda hard to figure out what might be causing it without being able to see it for ourselves!