luckperms persistence does not remember users after server restart

[vorburger]

Found another problem while working on #10 :

The thing I did to make luckperms' YAML persistent on the PV does not seem to be working.

When I promote players, that is lost after a restart.

[vorburger]

I think I misinterpreted what is going on here... persistence works, BUT we can only promote if a Player is online? It probably works if the server remains up, but after a restart, which we do frequently due to CI/CD, LuckPerms looses previously connected players list, it seems. For example:

/lp user leviator68 showtracks

does not work after a server restart, says: "[LP] A user for leviator68 could not be found."

After leviator68 joined once, as long as the server remains up, even if that player disconnects, then it works - and shows that Player's correct track.

LP probably optimizes to not keep all players in memory? Smart, but not very practical, for us.

[vorburger]

TODO: Open an issue and contribute a fix to https://github.com/lucko/LuckPerms/issues ...