KTcustm doesn't mean that the ship gets stuck while entering. It gets stuck in the last lane when it exits. Or, well, when it's supposed to exit at least. Some "invisible part" of its hitbox gets intertwined with some "invisible part" of the lane hitbox, and the ship won't move forward. I know the bug, I've flown the ship and I showed it to the devs a couple of years ago. Soul's model doesn't have that bug.