Unable to cancel packet send events in Velocity and BungeeCord

[MemencioPerez]

Describe the bug
Trying to cancel a packet send event in Velocity or BungeeCord causes a disconnect.

Software brand
Velocity 3.3.0-SNAPSHOT build 390 and BungeeCord 1.20-R0.3-SNAPSHOT build 1842.

Plugins
Plugins: chatsentinel, packetevents, unsignedvelocity, cleanstaffchat, easycommandblocker, epicguard, execute, librelogin, litebans, luckperms, mysqlandconfigurateforvelocity, partyandfriends, max-friends, minimotd-velocity, multilobby, rewhitelist, skinsrestorer, spark, tab, tradeproxy, velocityplus

How To Reproduce
Steps to reproduce the behavior:

1. Create a PacketSendEvent listener in Velocity or BungeeCord
2. Listen for any packet and set the event as canceled
3. Join your proxy and test your listener
4. See the disconnect

Expected behavior
Canceling the event should prevent the packet from being sent to the client.

Screenshots

Additional context
It seems that with some packages that are not registered in Velocity, the acceptOutboundMessage check that is called from the write method within the MessageToByteEncoder class returns false because it expects a com.velocitypowered.proxy.protocol.MinecraftPacket but ''msg'' is an instance of PooledSlicedByteBuf, and in that case the write method of the ChannelHandlerContext class is called directly.

Anyway, canceling the packet "works" after passing the buffer through the clear method of the ByteBufHelper class, but I guess calling a direct write because the acceptOutboundMessage check returns false isn't the best option, right?