pressing /minecraft: and tab, shows luckperms permissions have been namespaced under minecraft.

Git-Spigot-037559e-752cf95
LuckPerms v5.0.39

Side-effect of LP using brigardier (library from Mojang used for command suggestions in 1.13)

There was a reason for doing this, I can't exactly remember what it was though...

Might no longer be necessary, I think it was to do with working around a CraftBukkit quirk.