This is an issue related to have docks on your design. Ship size does not matter as this even occurs on the smallest of examples.

This is still an issue

This is definitely not fixed, I'm having the same issues on the server I play on. I have 5 shipyards on the same station and the problem happened to all of them at the same time. In some cases the ship design won't load past 75%. In other cases it will load, but the option to build is greyed out. If I dock a real ship, the options are the same as if there was no ship docked, even though it recognizes the real ship is docked.

It is extra confusing, as cloning the design from an existing blueprint doesn't have this problem. (I do this all the time, as I only rarely deconstruct to design)
(yes, yes, yes, I'm aware you all want to get rid of blueprints, that does not negate the simple fact that cloning the design from a blueprint doesn't have the problem)

This is also happening to me as well and many others on the server I play on. Nothing we do seems to get our ship yard to work while other people on the server have the same issue but others don't experience it at all.

For the record, this is not fixed. The shipyards at my homebase have been unusable for the past two days because of this. Replacing the shipyard computer and manually re-linking fixes it to a degree but reintroducing old designs breaks the shipyard.

This is only partially a duplicate of T2411, as we cant even load new ships. I propose we merge this one with T2411 rather than replace?