Issue with datastore saving whenever the player leaves, can someone help diagnose it?

Okay- I am very much new to scripting, so there is a chance that the issue is very obvious. The code below -works-, as in, almost all of it but one single line.

local serverScriptService = game:GetService("ServerScriptService")
local dataStoreService = game:GetService("DataStoreService")
local httpService = game:GetService("HttpService")

local dataValues = script.dataValues

local serverModules = serverScriptService.serverModules
local dataStore = dataStoreService:GetDataStore("player_Data2")


--Load Data
game.Players.PlayerAdded:Connect(function(plr)
    local success, err = pcall(function()
    local key = "ID-".. tostring(plr.UserId)
    local getSave = dataStore:GetAsync(key)
    local dataFolder = Instance.new("Folder", plr)
    dataFolder.Name = "dataFolder"

    --Creates a copy of all datavalues and pastes them into DataFolder. It also makes sure each player has updated datavalues if I add a new one.
    for i, v in pairs(dataValues:GetChildren()) do
        local newData = Instance.new(v.ClassName)
        newData.Name = v.Name
        newData.Value = v.Value
        newData.Parent = dataFolder
    end
    --Check if the player already has data
    if getSave then
        --Has data, so we simply load the saved values into the values in the dataFolder
        for i, v in pairs(dataValues:GetChildren()) do
            local decodedData = getSave
            dataFolder[v.Name].Value = decodedData[i]
            print(i, v.Name, v.Value)
        end
    else
        --Does not have data, so we create an array of data for them.
        local saveData = {}
        for i, v in pairs(dataFolder:GetChildren()) do
            table.insert(saveData, v.Value)
            print(i, v.Name, v.Value)
        end
        local encodedData = httpService:JSONEncode(saveData)
        dataStore:SetAsync(key, encodedData)
    end
    end)
    if err then
        print("Error Loading Data.")
    end
end)

--Save Data
game.Players.PlayerRemoving:Connect(function(plr)
    local success, err = pcall(function()
        local dataFolder = plr:WaitForChild("dataFolder")
        local dataList = dataFolder:GetChildren()
        local key = "ID-".. tostring(plr.UserId)
        local saveData = {}
        for i, v in pairs(dataList) do
            table.insert(saveData, v.Value)
            print(i, v.Name, v.Value)
        end
        local encodedData = httpService:JSONEncode(saveData)
        dataStore:SetAsync(key, encodedData)
    end)
    if err then
        print("Error Saving Data.")
    end
end)

The issue comes in game.Players.PlayerRemoving... Specifically this line, " dataStore:SetAsync(key, encodedData)". Everything up to that point works, just for some reason it doesn't save the data, albeit, when the player joins, and has no data, the same code does work. So I am confused about this.