Do yielding server side functions run fully even after the last player leaves?

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4

you could probably use a Boolean flag for this.

local isSafeToClose = true --global, at the top of your script

local function thisMustFinish()
    isSafeToClose = false
    --logic
    isSafeToClose = true
end

--then
game:BindToClose(function()
    repeat task.wait() until isSafeToClose
end)

note that BindToClose can only run for a maximum of 30 seconds… so you basically have a 30s time limit after the game is set to close