Now when the config is reloaded, the item updates ingame when its interacted with in any way.

Example:
If a lot of players have boomerang_1 from config as a stone axe, and you change it to a diamond axe and then restart server or reload config, when the players click or throw the boomerang, it'll convert from stone to diamond, and ofcourse its title and everything else will update too, even custom model data.