I'm using a 1.20.1 Fabric server with version 3.0.1 of the mod, and I've tried setting the config options allow_remote_breaking and allow_remote_unlocking to true. After restarting the server, I died and right-clicked the death compass, but there was no button to break (or unlock) the graves. I also tried using the /graves command, but it didn't work either.
I have only installed the mod on the server.

(config)

(death compass)

(/graves command)

There was no button to break (or unlock) the graves in death compass, and there was a button for break the graves in /graves command, but if I click it, the UI will quit and nothing happend.

There was no button to break or unlock the graves in the death compass, and although there was a button for breaking the graves in the /graves command, clicking it caused the UI to quit without anything happening.