Shipwrecks which generate onto beaches over a chunk boundary will sometimes have a different position/type in each chunk.
It appears that the part of the shipwreck over a chunk boundary and on land will generate differently to the part not on land. This will not happen with all shipwrecks - only ones in these circumstances.
Thank you for your report!
We're actually already tracking this issue in MC-149555, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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