Nice! Ship trespassing mechanics are in.
They removed the ability to get a "Channel joined notification" if an uninvited person trespasses on your ship.
The ship owner (and any party members) will be able to legally engage/kill the trespasser.
If you remove someone from your party while they're on the ship, they won't be considered as trespassing unless they injure anyone else on the ship (or leave and come back).