It appears that all upright shipwrecks are generating incorrectly. When crossing a chunk boundary one half will be one block lower and made of a different wood type than the other side. I encountered this multiple times on seed 344131611190769990 specifically at coords 1651, -7872.
MC-227264
Upright shipwrecks generate incorrectly on chunk boundary
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We're tracking this issue in MC-149555, so this ticket is being resolved and linked as a duplicate.
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