When a player leaves and is on the scoreboard, they still show up with their score and it's impossible to update or remove their score from the objective.
This is annoying when I reset my game and cannot reset all players if they have aren't currently logged in.
I am playing on a single player world which i occasionally open it to LAN for people to play on.
It's intended for it to be impossible to remove players who are not logged in from the scoreboard? There's no indication on the wiki that the command "scoreboard players reset <player>" only works for online players. I haven't tested it myself, so cannot confirm either way, but it's definitely not possible to call it "Working as Intended".