Saved Vanish States

By default every player with the vanish permission joins vanished (vanish-on-join: true). Saved states remember the choice a player made instead.

keep-vanish-state

keep-vanish-state: false
keep-vanish-state-persistent: false

With keep-vanish-state: true, the plugin remembers whether each player with the vanish permission was vanished when they left. When they come back, that wins over vanish-on-join: a staff member who unvanished and logged off joins visible next time.

Players with no saved state yet (first join since the restart) fall back to vanish-on-join and advancedvanish.join-vanished.

keep-vanish-state-persistent

On its own, keep-vanish-state only lasts until the server restarts. Also set keep-vanish-state-persistent: true to keep the states in plugins/AdvancedVanish/vanishStates.json. The file is read on startup and on /vanish reload, and written on shutdown (including the states of players who are still online). It's written to a temporary file first, so a crash can't leave it half written.

With cross-server sync

When cross-server sync is on, the network-wide state decides and these two options are ignored.