Describe the bug
I am using Debian GNU/Linux 10 (Buster) for my server. When I connected my Paper 1.8.8 #443 server to Waterfall 1.16 #391 proxy server, server started to kicking me. It kicks me every 15 seconds.

To Reproduce
Steps to reproduce the behavior:

1. Use Debian GNU/Linux 10 (Buster)
2. Install 'Waterfall proxy server'
3. Install 'Paper 1.8.8 server'
4. Connect them to each other
5. Disable "use-native-transport" in server.properties (Paper 1.8.8 does not support Java 15, thus I had to disable it.)
6. Disable "disable_tab_list_rewrite" and "disable_entity_metadata_rewrite" in waterfall.yml
7. Install ProtocolLib #493 or 4.5.1 (Recommended version for 1.8)
8. Connect to the server and try to walk or fly for one minute
9. Get kicked

Expected behavior
It shouldn't kick me.

Version Info
https://srcb.in/dxAbjH61Vf

Additional context
It don't kick me in Paper 1.16 but I need Paper 1.8.8 for some servers.

I made research about that situation. A person said "Disable 'disable_tab_list_rewrite' and 'disable_entity_metadata_rewrite' in waterfall.yml", then I tried it. But it didn't fix my problem.

Then I deleted the ProtocolLib #483 (dev build) and it stopped kicking me. Thus problem is solved. But I need ProtocolLib for lots of my plugins. They need it. I tried ProtocolLib 4.5.1 and ProtocolLib #493 but they are still not working.

There are the error logs when I get kicked:
Waterfall: https://srcb.in/wOBJePbw5O
Paper: https://srcb.in/cKZQheozJN

I am really not sure if it is not about ProtocolLib, but when I delete it, problem is solving.

Why did you close this? Without no response?

What error are you kicked with?

There are the CONSOLE error logs when I get kicked:
Waterfall: https://srcb.in/wOBJePbw5O
Paper: https://srcb.in/cKZQheozJN

Unfortunately I am not in my home. I couldn't remember which error did I get in Minecraft screen when I kicked without closing Netty options...

But I found this one, this is in Minecraft kick message and this happens when I use Java 8 directory with Netty options enabled: io.netty.channel.AbstractChannel$AnnotatedConnectException

This is not about IP addresses, everything was normal but it broked when I change Java directory.

I'll go to home 24~ hours later, I'll send the other error in screen when I go. Sorry so much.

Also, I would be happy if anything happened, can you tell me anything about situation? Can you inform me please sir?

This is the Minecraft screen one: https://prnt.sc/yafg0q
And this one is proxy (Waterfall) error: https://srcb.in/BpWTY8wse6
This one is normal (Paper) server error: https://srcb.in/cfSuNqfJYX

The one when I close Netty options and using ProtocolLib.
I just noticed now, I already sent every error to you.