The Ship Generation in the other end dimension has been cut in half for me many time
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This ticket has been marked as a duplicate of MC-86232, in favor of the more general or better information provided.
It's not just ships, the rest of the structure can be cut off too.
For that matter, the same bug may be what's preventing many of the cities from generating at all (I go to the coordinates stored in EndCity.dat and nothing is there). There's no reason these structures should be cut off at chunk boundaries.