Error log but I don't know what it does

[PSYCHEER]

Terms

• [X] I'm using the very latest version of CosmeticsCore and its dependencies.
• [X] I already searched on this Github page to check if the same issue was already reported.
• [X] I already searched on the plugin wiki to know if a solution is already known.
• [X] I already searched on the Discord server to know if anyone already provided a solution in the past for the issue.

Discord tag (optional)

PSYCHEER

What happened?

https://mclo.gs/jmp02gK

Steps to reproduce the issue

Change world probably as I see from the log

Server version

CosmeticsCore Version

ProtocolLib Version

LoneLibs Version

FULL server log

No response

Error (optional)

[02:48:19] [Server thread/WARN]: [CosmeticsCore] Task #3100551 for CosmeticsCore v1.3.0-release-2 generated an exception
java.lang.UnsupportedOperationException: null
    at java.base/java.util.ImmutableCollections.uoe(ImmutableCollections.java:142) ~[?:?]
    at java.base/java.util.ImmutableCollections$AbstractImmutableList.remove(ImmutableCollections.java:260) ~[?:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.nms.aH.impl.v1_21_1.b(SourceFile:199) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.y.b(SourceFile:165) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.y.bm(SourceFile:145) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.y.q(SourceFile:93) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.y.c(SourceFile:103) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.j.a(SourceFile:467) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.H.a(SourceFile:402) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.H.a(SourceFile:489) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.aH.run(SourceFile:131) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:86) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:475) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1763) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:513) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1635) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1335) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:334) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
[02:48:19] [Server thread/WARN]: [CosmeticsCore] Task #3100686 for CosmeticsCore v1.3.0-release-2 generated an exception
java.lang.UnsupportedOperationException: null
    at java.base/java.util.ImmutableCollections.uoe(ImmutableCollections.java:142) ~[?:?]
    at java.base/java.util.ImmutableCollections$AbstractImmutableList.remove(ImmutableCollections.java:260) ~[?:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.nms.aH.impl.v1_21_1.b(SourceFile:199) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.y.b(SourceFile:165) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.y.bm(SourceFile:145) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.y.q(SourceFile:93) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.y.c(SourceFile:103) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.y.aY(SourceFile:69) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at CosmeticsCore_1.3.0-release-2.jar/dev.lone.cosmeticscore.main.i.ai(SourceFile:560) ~[CosmeticsCore_1.3.0-release-2.jar:?]
    at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:86) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:475) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1763) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:513) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1635) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1335) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]
    at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:334) ~[purpur-1.21.1.jar:1.21.1-2304-dee41bc]

CosmeticsCore config.yml

No response

Problematic items yml configuration file (optional)

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Other files, you can drag and drop them here to upload. (optional)

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Screenshots/Videos (you can drag and drop files or paste links)

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