I keep getting this everytime I "end" the waterfall instance.
Water - 284
LuckPerms - 4.4.26

Just recently started, no idea why it continues to happen.
https://pastebin.com/raw/YAVkALRz

Not really something LuckPerms can fix.

It seems like Bungee/Waterfall is shutting down the scheduler, and then continuing to fire disconnect events. Ideally (and presumably in the past), these have happened the other way around.

Perhaps worth reporting to Waterfall?

As I said, not much I can do to easily fix.