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[BUG] io.netty.buffer.EmptyByteBuf.readByte(EmptyByteBuf.java:523) #261

Description

@NewTechDesign

One of the plugins has an issue when connecting a player from a browser (branded Eagler).
An "Internal Error" occurs on the client.

Velocity server logs:

[15:03:18 INFO] [limboapi]: Test (/127.0.0.1:50500) has connected to the LimboAuth Limbo
[15:03:18 ERROR]: java.lang.IndexOutOfBoundsException
[15:03:18 ERROR]: at io.netty.buffer.EmptyByteBuf.readByte(EmptyByteBuf.java:523)
[15:03:18 ERROR]: at net.lax1dude.eaglercraft.backend.server.base.pipeline.BufferUtils.readVarInt(BufferUtils.java:50)
[15:03:18 ERROR]: at net.lax1dude.eaglercraft.backend.server.base.handshake.VanillaInitializer.handleInbound(VanillaInitializer.java:107)
[15:03:18 ERROR]: at net.lax1dude.eaglercraft.backend.server.base.pipeline.WebSocketEaglerInitialHandler.encode(WebSocketEaglerInitialHandler.java:606)
[15:03:18 ERROR]: at net.lax1dude.eaglercraft.backend.server.base.pipeline.WebSocketEaglerInitialHandler.encode(WebSocketEaglerInitialHandler.java:51)
[15:03:18 ERROR]: at io.netty.handler.codec.MessageToMessageCodec$2.encode(MessageToMessageCodec.java:85)
[15:03:18 ERROR]: at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:90)
[15:03:18 ERROR]: at io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:130)
[15:03:18 ERROR]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:798)
[15:03:18 ERROR]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:737)
[15:03:18 ERROR]: at io.netty.handler.timeout.IdleStateHandler.write(IdleStateHandler.java:306)
[15:03:18 ERROR]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:798)
[15:03:18 ERROR]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:737)
[15:03:18 ERROR]: at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:116)
[15:03:18 ERROR]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:800)
[15:03:18 ERROR]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:737)
[15:03:18 ERROR]: at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:120)
[15:03:18 ERROR]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:800)
[15:03:18 ERROR]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:737)
[15:03:18 ERROR]: at net.elytrium.limboapi.thirdparty.fastprepare.handler.PreparedPacketEncoder.write(PreparedPacketEncoder.java:66)
[15:03:18 ERROR]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:800)
[15:03:18 ERROR]: at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:737)
[15:03:18 ERROR]: at io.netty.channel.DefaultChannelPipeline.write(DefaultChannelPipeline.java:1036)
[15:03:18 ERROR]: at io.netty.channel.Channel.write(Channel.java:267)
[15:03:18 ERROR]: at com.velocitypowered.proxy.connection.MinecraftConnection.delayedWrite(MinecraftConnection.java:253)
[15:03:18 ERROR]: at net.elytrium.limboapi.server.LimboImpl.onSpawn(LimboImpl.java:572)
[15:03:18 ERROR]: at net.elytrium.limboapi.server.LimboImpl.spawnPlayerLocal(LimboImpl.java:462)
[15:03:18 ERROR]: at net.elytrium.limboapi.server.LimboImpl.lambda$spawnPlayerLocal$1(LimboImpl.java:551)
[15:03:18 ERROR]: at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:148)
[15:03:18 ERROR]: at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:141)
[15:03:18 ERROR]: at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:535)
[15:03:18 ERROR]: at io.netty.channel.SingleThreadIoEventLoop.run(SingleThreadIoEventLoop.java:201)
[15:03:18 ERROR]: at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:1195)
[15:03:18 ERROR]: at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
[15:03:18 ERROR]: at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[15:03:18 ERROR]: at java.base/java.lang.Thread.run(Thread.java:1583)
[15:03:18 INFO]: [connected player] Test (/127.0.0.1:50500) has disconnected: ?? ???????? ????????????? ?????????? ?????????????????? ??????? ???????!
[15:03:18 INFO] [limboapi]: Test (/127.0.0.1:50500) has disconnected from the LimboAuth Limbo
[15:03:18 INFO]: [initial connection] /127.0.0.1:50500 has disconnected

Also

[15:03:07 WARN]: The server channel initializer has been replaced by java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)

Velocity info:
velocity-3.5.0-SNAPSHOT-605

Velocity plugins:

[15:11:55 INFO]: Plugins: velocity, luckperms, maintenance, advancedserverlist, skinsrestorer, eaglerxserver, limboapi, limboauth, packetevents, pl-hide-pro, velocity-tools

Removing any plugin from the chain works, but if you use this specific combination:
limboapi
limboauth
packetevents

eaglerx breaks.

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