Boomerang Cargo Glitch

I have just discovered this glitch with the Boomerang Cargo calculations.

If you are carrying a ship it counts towards Total Mass, but does not reduce the cargo capacity.

I have a colony that is some distance from the Inner Nine and was trying to get a Boomerang there with one Manta aboard. After I loaded the Manta I filled up with Hydrogen.

The Hyperjump would not execute because the ship's mas exceeded the Mass Capacity of the Jump Drive.

Once I unloaded an amount of hydrogen equivalent to the mass of a Manta, the jump went ahead successfully.

I'm not sure if this is a recent change, but I am very certain this has never happened to me before and have used a Boomerang a lot in the past.