[MC-1185] Some Mobs disappear after save&quit and reload or after unloading/loading the chunk they are in Created: 29/Oct/12  Updated: 07/Sep/15  Resolved: 19/Feb/13

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Minecraft 1.4.1, Minecraft 1.4.2
Fix Version/s: None

Type: Bug
Reporter: Sphax Assignee: Unassigned
Resolution: Works As Intended Votes: 0
Labels: mob
Environment:

Not related to environnement


Issue Links:
Duplicate
is duplicated by MC-10591 Not sure if this is a bug, but i put ... Resolved
is duplicated by MC-2900 Squids Escape Resolved
Confirmation Status: Unconfirmed
Game Mode: Survival

 Description   

I've seen this bug on my test level where I put Mobs in glass cages. (to let me see how the new textures are on them).

To reproduce it, make a glass cage 3 blocks high with only a space of 1 block in it:

  • Top view : 3x3 glass with a hole at the center
  • Side view : 3x4 glass with a hole of 3 blocks high at the center

Create the following Mobs with their Spawn Egg inside cage:

  • Witch : Can disappear
  • Ocelot : Can disappear
  • Blaze : Can disappear
  • Bats : Can disappear (and sometimes can pass through glass blocks)
  • Cave spider : Disappear
  • Villager : Can Can disappear
  • Silverfish : Can disappear
  • Enderman : Can disappear
  • Cow : Never disappear
  • Pig : Never disappear
  • Sheep : Never disappear

It happens when you walk far away and come back where the cages are.
Or, it can also happen after several quit/reload the level.



 Comments   
Comment by Ethan L! [ 19/Jan/15 ]

I'm getting this, too. I spawn some zombies, creepers, skeletons and villagers, all spawned with the PersistenceRequired:1 tag, and yet when I come back, half of them are gone. If this is intended, it should really be changed, as there is no reason this should happen at this point.

Comment by Jamie Hart [ 14/Dec/13 ]

I put villagers in holding cells inside the village itself so they wouldn't wander around for trading purposes, this is the second time, all of them have disappeared. first time i thought they were too far outside the village boundaries, so i destroyed those holding cells and put them all inside the village boundaries. I went to the end, got killed. and when i got back to the village, all the holding cells were empty again. it took me awhile to get all those villagers in those cells, and have them as suitable trading partners, now they are gone. this needs to be fixed.

Comment by Tails [ 19/Feb/13 ]

This works as intended an can be read up on the Minecraft Wiki.

Comment by Sphax [ 10/Feb/13 ]

I don't know if it's a bug or WAD because I remember that Notch said ALL mobs will be persistent in the future... Currently, I understand only some of them are persistent...

Comment by Jason Chmielewski [ 29/Nov/12 ]

More specifically, most hostile mobs are non-persistent (meaning they despawn,) and most passive and trained mobs are persistent (meaning they remain in-game.)

This is working as intended.

Comment by kaleb bacon [ 05/Nov/12 ]

This happens because minecraft unloads chunks meaning all animals, mobs in them are despawned.

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