Turtles hatched from eggs despawn

Device played on: iPhone 7 with 128 GB storage

Turtles hatched from eggs are able to despawn.

How to replicate: 

1) Go onto any world

2) Spawn in two turtles on a sandy area

3)Breed the two turtles and wait for them to lay an egg

4) Wait for the egg to hatch

5) Fly away to the point where mobs should instantly despawn

6) Fly back

Expected Result: Baby Turtles should still be there

Actual Result: Baby Turtles despawned

Attached is a Mediafire link of the video, which was too large to attach here

https://www.mediafire.com/file/59bgpor3ioebakq/RPReplay_Final1608132356.mp4/file