Paper: [Paper Async Chunk Task Thread/WARN]: Error while deserializing minecraft:xxxxx

[Redlnn]

Timings or Profile link:

https://timings.aikar.co/?id=76a7f673867a4e7eb9164e06ea09eee4

Description of issue:

Send "Error while deserializing minecraft:xxxxx" spam to the game log
xxxx can be displayed as _snow_pile_, _spruce_tree_, _ice_pile_, _spruce_tree_, _hay_pile_, _cactus_, _normal_tree_, _plain_flower_ and many more

Then the server will have a huge lag, but the value of TPS is always 20

[21:13:05] [Paper Async Chunk Task Thread #0/WARN]: Error while deserializing minecraft:savanna_tree

Plugin list:

CoreProtect, EditableSign, Invsee, JoinMessagePlus, LaggRemover, LuckPerms, MinecraftStatistics*, PlugMan, ProtocolLib, RFChairs, SuperVanish, WorldEdit

Paper build number:

Paper version git-Paper-8 (MC: 1.15) (Implementing API version 1.15-R0.1-SNAPSHOT)

[electronicboy]

How did you generate your world? You have blocks whos names aren't in the game...

[Redlnn]

My world was upgraded from Paper-236 with --forceUpgrade

[electronicboy]

https://bugs.mojang.com/browse/MC-167027

[electronicboy]

Had a quick look, basically; Mojang have dropped some generation features in 1.15, however; They've not actually pulled those out of chunk data as it's converted, thus leading to these warnings as these chunks are loaded

[claudio4]

Same problem even after deleting the worlds folders and regenerating them.

[R4z0rX]

Same here with latest build of Paper 1.15.2 (# 118). The world was previously generated with 1.14.4.

[EmpathyHeals]

I'm getting this too:

13.03 04:04:03 [Server] INFO Previous version: git-Paper-105 (MC: 1.15.2)
13.03 04:04:03 [Server] INFO This server is running Paper version git-Paper-126 (MC: 1.15.2) (Implementing API version 1.15.2-R0.1-SNAPSHOT)

13.03 02:49:28 [Server] WARN Error while deserializing minecraft:normal_tree
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:normal_tree
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:normal_tree
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:hay_pile
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:plain_flower
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:normal_tree
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:normal_tree
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:hay_pile
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:normal_tree
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:normal_tree
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:hay_pile
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:normal_tree
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:hay_pile
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:plain_flower
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:plain_flower
13.03 02:49:28 [Server] WARN Error while deserializing minecraft:hay_pile

[Panderine]

I'm having this too. Is this a real issue regarding gameplay? This is a 1.14.4 generated world updated to 1.15.2 always using papermc.

[sannielollie]

Same issue aswell - i dont know if and if yes - how far it is breaking the game. A world reset is really not a option. https://pastebin.com/zScRFf1q

Im using ConsoleSpamFix plugin now to "hide" the Error while deserializing message in my console and logfiles, so they wont get bigger than they already are..

[aikar]

This was a vanilla data conversion issue for 1.14. Since we are well into 1.15 now, and I believe the issue is primarily log spam, just going to close, as trying to touch Data fixers is a scary thing...

Do as @sannielollie suggested and use a log filtering plugin.