[MC-229490] Chickens in caves

So I was going through the caves and I saw a chicken then I went into spectator to see if it was a bug and I was a LOT of chickens in the caves.

Linked issues

is duplicated by 10

MC-229663 Chickens spawn in caves without walking in or spawning on grass. I found 6 chickens in one cave and zombies did not despawn do to the eggs they picked up Resolved

MC-230190 Chickens spawning underground leading to zombies picking up eggs Resolved

MC-230594 Zombies holding eggs underground Resolved

MC-231047 [1.17] Loads of chickens spawn in caves causing zombies to not despawn Resolved

MC-231732 Chickens spawning in caves. Resolved

5 more links

Attachments

2021-06-27-2.log.gz

Comments 19

Jess Edward 2021-06-18T17:38:46Z

Cannot confirm. 2 is a lot?

Marty McFly 2021-06-18T18:43:56Z

Could've been a jockey that suffocated. Similar to MC-160201

Wormbo 2021-06-20T05:34:49Z

As far as I understand, "jockey chickens" should have a flag set that makes them despawn like hostile mobs and should prevent them from laying eggs. Unless something changed in that regard, that flag probably should not reset after the rider died, causing the chicken to continue to not lay eggs and eventually despawn. The suffocated jockey theory can only work if something now causes that flag to reset.

P 2021-06-21T09:14:19Z

Sorry I haven't said anything I thought it would take a lot longer for anyone to see this, but there were other chickens elsewhere (way to many for it to be jockeys), so I don't know why their spawning.

P.S. I guess this could make a cool feature as "Cave Chickens"

Lexi 2021-06-25T19:02:47Z

Worth noting (as mentioned in MC-229663) that these chickens can lay eggs which zombies then pick up, causing the zombies to become persistent/unable to despawn, causing mob cap to fill up over time, especially in frequent areas of servers like the world spawn

9 more comments

Johnibur 2021-06-25T20:35:37Z

If this issue occurs for you, please share a screen capture with the following information:

Get op permissions (if you are in singleplayer, click Open LAN in the pause menu then check "Allow Cheats"
Aim at one of those "cave chickens" and enter the following command:
/data get entity (press tab to auto-complete the unique entity id you are targetting at, then press return)

❌ I have been unable to reproduce this issue. I used a repeat command block to kill any mob entity but chickens to mingle the mob spawning at fast rate. The only chickens that I have seen underground are chickens jockey (attribute IsChickenJockey is true).

Johnibur 2021-06-25T21:42:55Z

Please read what I said above. Also your screenshot was taken on a Paper server. This tracker is only for the Vanilla game. (user removed their comment)

EonRaptor 2021-06-26T01:57:04Z

Johnibur-

We've been having this on a Vanilla 1.17 server where I have OP. The /data Get Entity returned an error but F3 shows the entity as a Chicken. See attached screen shot.

I am running Fabric client side for REI and Voxen minimap but server is Vanilla. We've also had a large number of chickens in the Nether.

We have players that reported seeing chickens spawning from zombie spawners. Our guess is that an error is occurring in the ChickenJockey chance and instead of spawning the jockey, its just spawning a regular chicken.

EonRaptor 2021-06-26T02:09:00Z

Johnibur-

Following up. Got it. Attached is the screen shot of the Entity data of the "cave chicken." The value for "isChickenJockey" is "0b"

See attached screen shots

anthony cicinelli 2021-06-26T02:32:32Z

@unknown your images also show a non vanilla environment with spigot and bukkit enabled

Shourin 2021-06-26T14:51:25Z

Our server is 100% vanilla. The only change is my resource pack changes zombies to have random skins. We have actually had to purge zombies using /kill commands to stop lag.

EDIT. Added a screenshot submitted by a server member. Also they should despawn unless they are holding something more valuable than just junk items.

Johnibur 2021-06-27T07:31:12Z

Screenshots do not tell us more about this issue.

1. Please attach a sample of your server logs. You can find your server logs under the logs folder.

2. Please submit a screenshot of the output of the command /data get entity <press tab> <enter> when you aim at one of those chickens.

EonRaptor 2021-06-27T19:31:01Z

Johnibur-

Spun up a new fully vanilla server, attached is the F3 on a chicken showing y21 and the output of /data get entity.

This chicken has IsChickenJockey: 0b as well.

EonRaptor 2021-06-27T19:32:50Z

After watching the chicken a bit, it laid an egg, which is the problem with these non-ChickenJockey chickens spawning in caves. The Zombies are picking up the eggs.

Thank you,

EonRaptor

EonRaptor 2021-06-27T19:37:18Z

And just got server log from the vanilla server. Attached.

slicedlime 2021-06-29T07:52:16Z

Server log still shows the bukkit resource pack. Just loading the world from the bukkit server in a vanilla server does not count as a repro case in vanilla - chickens in the world caused by a modded server will obviously still be there when loaded by a vanilla one.

Thommy Siverman 2021-06-29T09:38:57Z

Seems to be caused by bukkit.

EdPhonez 2021-06-29T16:00:56Z

This was fixed in paper https://github.com/PaperMC/Paper/issues/5994. Please update.

Shourin 2021-07-01T21:06:02Z

We had the issue when our server was "vanilla" as servers such as bukkit / spigot ETC was not available for 1.17. yet.