This has to do with Controls Ionized effects and Ion Cannon damage.
Controls ionized means the ship loses -1D from maneuverability, shields and weapon fire control and damage for the rest of that round and the next round. If the ship has as many controls ionized as maneuverability dice, its controls are frozen for two rounds.
But does the controls frozen take into account -1D from maneuverability from controls being ionized? For instance, a ship has 3D maneuverability. It gets a control ionized from being hit, meaning its manevuerability is now 2D for this and next round. So now if the ship is hit again, either this round or next round, and the ship goes up to 2 controls ionized, will the ship's control be frozen since the maneuverability is technically 2D?