Mobs suffocate in walls upon growing into adults

If a baby animal is stood close to a wall when it grows into an adult, it begins to suffocate because it is now partially inside the wall.

To reproduce: I suggest recreating my animal holding cell as in the screenshot and breeding to produce a baby. Watch until the baby grows into an adult; it will likely be stood near a wall at that time (the animals seem to stand near the walls a lot) and suffocate.