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The docs suggest it was...
There’s circa 1300 still unresolved bugs introduced in 1.13, it’s not just world conversion and it’s not even just the world conversion everyone...
You could just try again
Please open a feature request to the bug tracker
This is SPIGOT plugin development, I suggest you refamiliarize yourself with the forum rules.
Could try using lsof to see what region files are open
5 minutes, or when the chunk is unloaded.
Maybe you changed the configuration or ran save-off ?
Yes multicraft has chat commands which can be triggering by admins with permission
Possibly usage of so much swap is slowing down your disk and therefore saving.
Your server ideally should never use swap.
SSD is a must for Minecraft
That looks like you are using a plugin give command (Essentials?)?
Maybe you want to use the Vanilla version, /minecraft:give