Shadow Knight & Boats

I understand some things in DST are left unbalanced so those who don't want to learn to do combat can still cheese bosses... but this seems more like a bug and goes against the spirit of the game...

Make multiple knight statues before a new moon, for this example let's say 40, and 1 bishop and rook.

You trigger the shadow pieces to spawn & hop onto a boat safely off shore with gunpowder placed on the shore. The bishop and rook follow you to your boat due to their teleporting mechanics, but the knight can't teleport and can't walk on water, so he is stuck against the shore, once you kill the bishop & rook you have 40 level 3 shadow knights, which is 200 nightmare fuel, 40 dark swords & 40 shadow atrium's once you ignite the gunpowder you placed earlier.

I think this is way more cheaty than any other boss cheese in DST simply due to the easy nightmare fuel farming that can be done. 

A simple fix to this would be to allow the shadow pieces to pass over water, they're shadows after all. Boats and traversable water were added long after the atrium & fuelweaver, so this is an oversight from an update as apposed to a feature that was meant to be implemented.