Stack trace
https://mclo.gs/Y1hxdd9
Plugin and Datapack List
PerfoBooster, PunisherX, AntiSeedCracker, AntiSpammer, AutoMessage, BedrockCombatCompat, Chunky, ChunkyBorder, CommandAPI, DeathCoords, DynamicLights, floodgate, GroupChat, Hurricane, JoinCommands, KillCommand, LagShield, LocatorToggle, LuckPerms, NoChatReports, Penguin, playerKeepInventory, ProtocolLib, SimpleDeathCoordinates, SkinsRestorers, UltimateAutoRestart, Vanish, WorldEdit, WorldGuard
Actions to reproduce (if known)
- Migrate a world that previously contained modded blocks to a Paper server.
- Enable Anti-Xray (Engine Mode 1 or 2).
- Fly around or teleport to trigger the generation/loading of these specific old chunks.
Paper version
This server is running Paper version 26.2-111-main@f570646 (2026-08-07T16:16:19Z) (Implementing API version 26.2.build.111-stable)
You are running the latest version
Previous version: 26.2-91-281bd76 (MC: 26.2)
Other
Description
The server randomly crashes on a worker thread with an Unexpected palette resize exception during chunk loading.
Context: This world was originally generated and used on a modded server (Forge/Fabric). It was recently migrated to Paper. The crashes occur specifically when players move around and trigger the loading of these previously modded chunks. It seems the Anti-Xray controller encounters unexpected or corrupted block palette data left over from modded blocks, causing a race condition or an unhandled exception on the ForkJoinPool worker thread.
Stack trace
https://mclo.gs/Y1hxdd9
Plugin and Datapack List
PerfoBooster, PunisherX, AntiSeedCracker, AntiSpammer, AutoMessage, BedrockCombatCompat, Chunky, ChunkyBorder, CommandAPI, DeathCoords, DynamicLights, floodgate, GroupChat, Hurricane, JoinCommands, KillCommand, LagShield, LocatorToggle, LuckPerms, NoChatReports, Penguin, playerKeepInventory, ProtocolLib, SimpleDeathCoordinates, SkinsRestorers, UltimateAutoRestart, Vanish, WorldEdit, WorldGuard
Actions to reproduce (if known)
Paper version
This server is running Paper version 26.2-111-main@f570646 (2026-08-07T16:16:19Z) (Implementing API version 26.2.build.111-stable)
You are running the latest version
Previous version: 26.2-91-281bd76 (MC: 26.2)
Other
Description
The server randomly crashes on a worker thread with an
Unexpected palette resizeexception during chunk loading.Context: This world was originally generated and used on a modded server (Forge/Fabric). It was recently migrated to Paper. The crashes occur specifically when players move around and trigger the loading of these previously modded chunks. It seems the Anti-Xray controller encounters unexpected or corrupted block palette data left over from modded blocks, causing a race condition or an unhandled exception on the ForkJoinPool worker thread.