Baby turtles get stuck inside of soul sand, mud and 8 layers of snow

Baby turtles (and I would assume other tiny mobs) get stuck in the soul sand base of bubble columns. It mostly seems to occur in columns only a few blocks high or less. As they bounce around they sometimes fall into the soul sand and remain lodged there, never rising back up or even moving. They do not get stuck if there is no water. This does not seem to be something that is "working as intended". In the second image if you look closely you can see the 3 hitbox outlines in the soul sand. I have not tested this outside this snapshot.