Baby Rabits sink in water

When i was testing out whether rabbits bred or not i noticed one leapt off of my plat form and sank. I used a custom world that i turned up ocean to max size but i spawned one under water and used it for the photo.

Recreating the problem is simple; Simply force a baby bunny off a water edge and make sure it can sink, then observe that it cannot swim and simply hops at the bottom.