Whenever I've found a shipwreck lately of a ship that is whole or almost whole there tends to be signs that it is two shipwrecks generated together. Two different heights, two different trapdoor types, four different wood types.
It doesn't seem to be present in all more complete shipwrecks, but it does seem relatively common.
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We're tracking this issue in MC-131745, so this ticket is being resolved and linked as a duplicate.
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