Atlas generation bug - Landlocked Castaway

Bug ID:1400664607

As shown in the image below, I got a Castaway map (Castaway 13, 845%) that generated inland instead of near the ocean. I guess the little pond the Castaway is sitting on could technically count as a water biome, but I'm not sure if the devs intended a ‘coastal map’ to spawn on such a small body of water.