Hello, I have noticed that the plugin takes a very long time to shutdown on Velocity (I tested with versions 1.0.5 and 1.0.8 of velocity, and build 151 of LuckPerms). It can take up to 1 minute to shutdown
MariaDB storage, Redis messaging, everything else is default settings.

Issue does not happen on BungeeCord with the same settings

How long is very long?

"It can take up to 1 minute to shutdown"

I should stop responding to issues when I’m half asleep. My apologies.

How long is very long?

Could you try generating a thread dump while it's hanging?

If you're on unix, you can use jps to get a list of the Java process pids. Identify which process is your Velocity instance, then run jstack <pid>.