Reproducible by using the getStructurePos function to find a shipwreck in any version from MC_1_13 to MC_1_15 (or by using cubiomes-viewer to locate one in these versions), loading up the seed in-game in the corresponding version, and verifying that the reported positions differ from the result of /locate Shipwreck.
For instance, seed 7568941961015246499 is described by cubiomes-viewer as having a shipwreck at 32, 32 in any of these three versions, whereas for all of them the correct location for that region is 112, 112.
Reproducible by using the getStructurePos function to find a shipwreck in any version from MC_1_13 to MC_1_15 (or by using cubiomes-viewer to locate one in these versions), loading up the seed in-game in the corresponding version, and verifying that the reported positions differ from the result of /locate Shipwreck.
For instance, seed 7568941961015246499 is described by cubiomes-viewer as having a shipwreck at 32, 32 in any of these three versions, whereas for all of them the correct location for that region is 112, 112.