The problem stills, but I can't just reopen previous issue - have no permissions.

Bug:
I just downloaded last version -- EnderContainers-2.3.0-SNAPSHOT.jar.
The error in console is same: nothing changed at all (compared with difftool).

Hello! This is due to new protocol version used in Minecraft 1.19.4.. I'm working on it!

@denvolj This should now work for Spigot 1.19.4 too. Sorry for the inconvenience!

Can you tell me if this works on your server with the latest version 2.2.3/2.3.0?
You can download builds here: https://github.com/utarwyn/EnderContainers#downloads