I set the soverign to auto-explore, and he set an autopilot destination that was directly to the lower left of his current position. I then accidentally clicked the next turn button seveal times within the space of a second (I was using a laptop touchpad that clicks by tapping the center). That turn, a message window came up saying I had researched some tech. When I clicked it off, the soverign shot streight towards the autopilot destination, and right through it, and did not stop until he was a fair ways across the map. During this process, he did not clear the FOW, although when he stopped the area around him was revealed normally.