Hostile mobs cannot be sent through nether portals. I was having fun in my creative world. I sent a Zombie pig man and a creeper through the nether portal by pushing them. But when i went through they were no where to be found. I tried sending a horse and a villager through the portal and back. They made it out OK but the hostile mobs seem to vanish.
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Is this intentional? because i have done that in past versions and the mobs never despawned. I have a Zombie Pigman Farm and it works by forcing zombie pigman through portals and i kill them in the overworld. it used to work but since 14w18b it has not.
The hostile mobs despawned, because on the "other side" of the portal was no player, since you were in single player.