Things I found out so far:
– Moving a ship even one block will create water inside the ship below the sea level (see attachment).
– When using the golden hoe or CRUISE to move the ship, one will one will fall off the ship eventually (player movement doesnt match ship – see attachment, tested in dhow). That is also true when ascending or descending a sub (tested in Barracuda & Seawolf).
– using [helm] sign can push you into a block.
– ‘/cruise west/north/south/east’ command error – No Permission.

Follow link for demonstration – https://imgur.com/a/idxRkM8

Baz