I just tried Seaworthy from Shipwrecked to RoG and I died because of a shadow creature in RoG. I restarted in RoG even if I was playing Shipwrecked before.
I don't know if it's a bug or not but maybe it's useful to improve early access of the Seaworthy funcion.
(Sorry for my bad English)
use seaworthy while mad and die just after the arrive in RoG