shipwrecks, ever since being added to the game in 1.13, have contained doors. But, this has a problem. This is because doors cannot be waterlogged (which doesn't seem logically consistent, considering that trapdoors can.). As a large portion of shipwrecks are generated underwater, it's out of place for an unwaterlogged door to be generating in the middle of a soggy shipwreck.  To solve this, I would either make doors able to be waterlogged, or remove them from shipwrecks.