I have discovered with seed -5585680237520386540 at coordinates -4330 ~ -9020 a shipwreck (oak & birch style) spanning across the intersection of 4 chunks. In one chunk ( -271 ~ -574) the shipwreck takes a different styling of planks (spruce and dark oak). Just thought I would report this as it is clearly a bug.

Edit: I have since found another example: seed -1699185818991075921 at coordinates -4060 ~ 4540