I'm not sure if this will have any effect on your issue or not, (as per changelog) I did notice that value is set to -1 by default in the database. I haven't tested anything to see if 4 = floating does anything special for boats.
== 7/10/2019 ==
Akkadius: Add #npcedit flymode [0 = ground, 1 = flying, 2 = levitate, 3 = water, 4 = floating]
Akkadius: Added "flymode" to npc_types database table
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