Type of bug

Error in console, Other unexpected behaviour

/ess dump all output

https://essentialsx.net/dump.html?id=6841a97ffb08486b9f14f71dc9fe4392

Error log (if applicable)

https://paste.gg/p/anonymous/fd1c5d11ce4a4d75993fb400487804fa

Bug description

Certain commands, such as "/spawn" or "/home " result in "java.lang.IllegalArgumentException: Modifier is already applied on this attribute!" and then all future interactions with the chat (be it chat or command) will return "Chat disabled in client options" until logging out and back into the server.

This only appears to happen with EssentialsX commands.

Steps to reproduce

Same as Bug Description

Expected behaviour

Commands should just work!

Actual behaviour

java.lang.IllegalArgumentException: Modifier is already applied on this attribute!
Chat disabled in client options

Additional Information

No response

I cannot reproduce this on my test environment using the latest 1.21.3 paper build, and essx dev build 128.
i would try to isolate your server to only have essx, and supported plugins (luckperms, vault, and any essx addons) and see if the issue still occurs.
I do see coreprotect being mentioned in the stacktrace you provided, but that would be odd if it was only essx commands.
closing for now, can re-open if this is able to be replicated later.