PaperMC / PaperMC/Folia

Thread failed main thread check: Accessing entity state off owning region's thread java.lang.Throwable: null with Zombie

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Description

Stack trace

https://mclo.gs/3esxcqP#L1728

Plugin and Datapack List

pl
[14:54:34 INFO]: ℹ Server Plugins (62):
[14:54:34 INFO]: Paper Plugins (5):
[14:54:34 INFO]: - CarbonChat, emotecraft, EnchantedBook, FancyNpcs, MoreFoWorld
[14:54:34 INFO]: Bukkit Plugins (57):
[14:54:34 INFO]: - AntiHealthIndicator, ArmorStandEditor, AutoWhitelistRemove, AxInventoryRestore, BreweryX, Chunky, CoreProtect, CoreProtectTNT, Craftorithm, DeluxeMenus
[14:54:34 INFO]: EasyPayments, Essentials, EssentialsSpawn, FlagsH, GSit, HeadDatabase, InteractiveSigns, InvisibleFrames, LiteBans, LuckPerms
[14:54:34 INFO]: Maintenance, mclogs, MilkyPixelart, NBTAPI, OreAnnouncer, packetevents, PlaceholderAPI, PlasmoVoice, PlayerHeads, ProtocolLib
[14:54:34 INFO]: pv-addon-discs, pv-addon-groups, pv-addon-lavaplayer-lib, pv-addon-sculk, pv-addon-spectator, rpchat, ShapelessPortals, spark, squaremap, squaremap-worldguard
[14:54:34 INFO]: squaremarker, StonecuttersPLUS, TAB, Terra, ToolStats, TWSAdmin, TWSCheck, TWSCore, UltimateAutoRestart, UltraCosmetics
[14:54:34 INFO]: UltraLeafDecay, Vault, visual-crafting, Votifier, VotingPlugin, WorldEdit, WorldGuard

Actions to reproduce (if known)

No response

Folia version

ver
[14:54:42 INFO]: Checking version, please wait...
[14:54:43 INFO]: This server is running Folia version 1.21.8-DEV-ver/1.21.8@910562b (1970-01-01T00:00:00Z) (Implementing API version 1.21.8-R0.1-SNAPSHOT)
You are running the latest version
Previous version: 1.21.8-6-782ce95 (MC: 1.21.8)

Other

No response

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the linked stack trace at https://mclo.gs/3esxcqP#L1728 and identify the Folia code producing the failed main-thread check for Zombie entity state. No reproduction steps, relevant file, or test are provided; the issue is done when the underlying off-thread access is understood and a verified fix prevents the reported check failure.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
backend, distributed-systems
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
20/100

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