A fully crewed ship, when borrowing from a fleet. --> When you remove some of your original crew, the borrowed crew will "occupy" slots --> and you will not be able to place back your own crew.
#Crew Borrow Bug
wheat turtle
if you borrow crew from your fleet - they seem to occupy beds - such that when you remove some of your original crew, you can't put them back - [while the crew display on the left says you have empty slots]
bronze scarab