Update: Even setting it to having 1 blocks worth of water causes it to not load properly.
Additionally I noticed that both the preset and the custom made set for the world when using the superflat creator says "water bucket" instead of water.
Does the superflat creator default water to water bucket even though in game (using the setblock command) it still changes the block to water?
World Doesn't load regardless of ocean monument tag for me, any world with "water" in the preset doesnt load the game properly.