A shipyard is unable to load a design.
It is able to physically show it to you (you can get in it too) but it never finishes the load state. It gets stuck at the end giving you an error (takes a while till the error pops up).
No core on design while loading!
It's fine if you create a new design, but unloading/loading that design will fail again.
It looks as if it looks at position 8 8 8 for the ship core but can't find it since that one is now located at 16 16 16. Can't confirm this though.