Describe the bug, provide any errors
crashes when right clicking a dispenser on a vanillaish(no plugins) paper spigot server i have no clue why this happens or if its something specific that is causing this

[10:06:46] [Netty Client IO #6/ERROR]: Unexpectedly disconnected from server! io.netty.handler.codec.DecoderException: java.lang.IllegalArgumentException: Invalid token at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:98) ~[netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:297) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:413) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:547) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:501) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) [netty-all-4.1.25.Final.jar:4.1.25.Final] at java.lang.Thread.run(Thread.java:831) [?:?] Caused by: java.lang.IllegalArgumentException: Invalid token at com.viaversion.viaversion.connection.UserConnectionImpl.transform(UserConnectionImpl.java:282) ~[25f568d0-aef2-4536-8d4f-8f2e822eb9c4.jar:?] at com.viaversion.viaversion.connection.UserConnectionImpl.transformClientbound(UserConnectionImpl.java:268) ~[25f568d0-aef2-4536-8d4f-8f2e822eb9c4.jar:?] at com.viaversion.viaversion.api.connection.UserConnection.transformIncoming(UserConnection.java:230) ~[25f568d0-aef2-4536-8d4f-8f2e822eb9c4.jar:?] at com.viaversion.fabric.common.handler.FabricDecodeHandler.decode(FabricDecodeHandler.java:38) ~[viafabric-0.4.1+181-main.jar:?] at com.viaversion.fabric.common.handler.FabricDecodeHandler.decode(FabricDecodeHandler.java:15) ~[viafabric-0.4.1+181-main.jar:?] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:88) ~[netty-all-4.1.25.Final.jar:4.1.25.Final] ... 29 more [10:06:46] [Netty Client IO #6/INFO]: Failed to sent packet io.netty.handler.codec.DecoderException: java.lang.IllegalArgumentException: Invalid token at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:98) ~[netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:310) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:297) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:413) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:265) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:647) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:547) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:501) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461) [netty-all-4.1.25.Final.jar:4.1.25.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) [netty-all-4.1.25.Final.jar:4.1.25.Final] at java.lang.Thread.run(Thread.java:831) [?:?] Caused by: java.lang.IllegalArgumentException: Invalid token at com.viaversion.viaversion.connection.UserConnectionImpl.transform(UserConnectionImpl.java:282) ~[25f568d0-aef2-4536-8d4f-8f2e822eb9c4.jar:?] at com.viaversion.viaversion.connection.UserConnectionImpl.transformClientbound(UserConnectionImpl.java:268) ~[25f568d0-aef2-4536-8d4f-8f2e822eb9c4.jar:?] at com.viaversion.viaversion.api.connection.UserConnection.transformIncoming(UserConnection.java:230) ~[25f568d0-aef2-4536-8d4f-8f2e822eb9c4.jar:?] at com.viaversion.fabric.common.handler.FabricDecodeHandler.decode(FabricDecodeHandler.java:38) ~[viafabric-0.4.1+181-main.jar:?] at com.viaversion.fabric.common.handler.FabricDecodeHandler.decode(FabricDecodeHandler.java:15) ~[viafabric-0.4.1+181-main.jar:?] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:88) ~[netty-all-4.1.25.Final.jar:4.1.25.Final] ... 29 more

How can we reproduce it?
i have no idea.... sorry

ViaVersion Dump
https://dump.viaversion.com/d84af2a10f0a012913f35fb30de13867868b5412ffec5ba6922ffc2eb92393d6

couldn't reproduce

oops my mistake:

server version

This server is running Airplane version git-Airplane-"813df1a" (MC: 1.16.5) (Implementing API version 1.16.5-R0.1-SNAPSHOT)
You are 16 version(s) behind
Previous version: git-Paper-571 (MC: 1.16.5)

mods that mess with protocols or may be a issue

multiconnect
optifabric (using optifine G8 1.16.5)
krypton
ferritecore
LazyDFU

There's a known incompatibility with older versions of krypton

duplicate of #130