Follow this template except for feature requests. Use pastebin when providing /protocol dump and any relevant errors.

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• You're using the latest build for your server version
• This isn't an issue caused by another plugin
• You've checked for duplicate issues
• You didn't use /reload

Debug paste link: https://pastebin.com/9HCa4ex8

Description and relevant errors: Server crashed, this was in the logs (spammed), has protocol lib errors in it?

ProtocolLib is in the stack trace, but nothing in there indicates that it's the cause

It appears that this crash would occur when entering a certain chunk. The crash only happened when Libs disguises is installed, when removed the chunk no longer causes the crashes?

libs disguises is validating entities and thus loading chunks, making your server not be able to keep up. this is not caused by protocollib. report this is lib.
I know that md made changes to how isValid works or smth, so that is something lib should look into. A isValid check shouldn't cause a chunk load, bukkit is drunk.