While playing in survival mode, turtle eggs don't appear to hatch. New world, fresh 18w08b install, in clean install folder. Turtles breed correctly and lay eggs on sand, but after several hours (more then 15 in-game days), eggs still have not hatched. Multiple clutches have been produced (16 eggs in total) with the same result. No custom world options were selected, aside from a custom seed. Eggs were continuously in a loaded chunk (generally within 2-3 chunks of the player) at all times. Saving and reloading had no effect.