Inventory datastore not working despite no errors?

I was writing an inventory datastore script that saves the items in the player's inventory and loads in when they join in the game next time. However, when I leave the game and join back, the weapons in my inventory I had previously don't load in my inventory now. No errors appeared on the output and there were no error messages in the pcall functions.

I put some weapons in a folder named Weapons which were in ServerStorage so I can see if the player has any weapons.

Script (A regular script in ServerScriptService):

> local DSS = game:GetService("DataStoreService")
> local InventoryDS = DSS:GetDataStore("InventoryDS")
> local Players = game:GetService("Players")
> 
> local function onPlayerAdded(plr)
>   local key = "User_"..plr.UserId
>   local inventoryReference = game.ServerStorage.Weapons
>   
>   local inventoryData
>   local success, errorMessage = pcall(function()
>       inventoryData = InventoryDS:GetAsync(key)
>       
>       if inventoryData then
>           print("check")
>           for i, weaponName in pairs(inventoryData) do
>               local weapon = inventoryReference:FindFirstChild(weaponName,true)
>               if weapon then
>                   print("1")
>                   local weaponClone = weapon:Clone()
>                   weaponClone.Parent = plr.Inventory
>               end
>           end
>       end
>   end)
>   
>   if success then
>       print(plr.Name.."'s inventory loaded successfully!")
>   else
>       print("There was an error. "..errorMessage)
>   end
> end
> 
> local function onPlayerRemoving(plr)
>   local key = "User_"..plr.UserId
>   local playerInventory = plr.Backpack:GetChildren()
>   
>   local playerInventoryTable = {}
>   
>   local success, errorMessage = pcall(function()
>       InventoryDS:SetAsync(key,playerInventoryTable)
>       
>       for i,weapon in pairs(playerInventory) do
>           print("2")
>           table.insert(playerInventoryTable, weapon.Name)
>       end
>   end)
>   
>   if success then
>       print(plr.Name.."'s inventory saved successfully!")
>   else
>       print("There was an error. "..errorMessage)
>   end
>   
> end
> 
> Players.PlayerAdded:Connect(onPlayerAdded)
> Players.PlayerRemoving:Connect(onPlayerRemoving)

As always, thank you for taking the time to read the script and I will appreciate any help I receive.