I tried to survey a ship graveyard with a fleet consisting of an Ysengard and a Praxis, but after the battle nothing happened. On my next turn I tried again and got this message:

So I hovered over the Ysengard ship and got the following description:

Note that the description states "The armed Survey Ship of the Mirazu Ysen.". I suspect that someone forgot to add the Survey component to this Prototype ship.