Describe the bug
Possible duplicate of #813, but this is happening under different conditions. I'm having players who, upon attempting to join the server, are disconnection with a "timed out" message. While this occurs, my in-game chat is flooded with ProtocolLib warnings. This doesn't happen to everyone.

To Reproduce

1. Player attempts to join the server.

Expected behaviour
Player is able to join the server successfully, not connect and time out upon logging in.

Screenshots

Message logged in-game when this user attempts to join.

Version Info
https://pastebin.com/ZA4k6zcB Dump

Additional context
https://pastebin.com/mz9UkmAZ latest.log output when this occurs

is it just that single player?

make a backup of his player data and delete it and see if he can join again.
I think he has an invalid item in his inv.