• GameRule waterCreatureSpawnHeightFromBottomWorld has been replaced with waterCreatureSpawnSeaDepth and no longer uses the bottom of the World and instead uses exact value, default is now -64.

• New GameRule waterCreatureSpawnSeaHeight

  • Allows the Maximum Height to be set to prevent spawning above a certain Height, default is 35

For Spawning to work correctly you must have a difference of at least 3 between the 2 GameRules