I don't know if this is a bug or more of an oversight but Hoglins despawn even when in a 20x20 closed space (fences) Every single other farmable animal in the game will not despawn when in an enclosed area however this is untrue for the new Hoglins. It would be great if they couldn't despawn when captured so that you can reliably farm them. 

What is the point of breeding Hoglins if they will despawn?

What I expected to happen was...:
For me to come back to my house and the Hoglins to still be in my fenced enclosure.

What actually happened was...:
The hoglins all despawned after I came back from my journey.

Steps to Reproduce:
1. Build i 20x20 fenced enclosure (or smaller)
2. Find a way to capture Hoglins in the enclosure (or spawn them in)
3. travel far away (or teleport away) and then come back, the hoglins have despawned.