[Half Solved] New panels are not generating correctly on my inventory system, what's the problem?

So I've made a massive inventory system that works similar to Murderer Mystery 2's one. It's data transfer and saving part is completed (And tested), but I'm having trouble with the panel generation.

It shows no error and I already debugged it nothing went wrong but a new panel didn't create.

Here's my script:

wait(2.5)
local rep = game:GetService("ReplicatedStorage")
local remote = rep.Remotes:WaitForChild("GetPlayerItemInfoCTC")
local remote2 = rep.Remotes:WaitForChild("SendPlayerItemInfoEvent")
local remote3 = rep.Remotes:WaitForChild("InventoryControlEvent")
local remote4 = rep.Remotes:WaitForChild("CloseAllGuisCTC")
local frame = script.Parent
local gui = frame.Parent
local panelHolder = frame:FindFirstChild("BlankHolder")
local plr = game.Players.LocalPlayer
local itemModule = require(rep.Modules.ItemLibrary)
local contentProvider = game:GetService("ContentProvider")

local quanityList = {}

local itemInfo = {}

local function checkHorizontalNumber(id, line)
	if line == 1 then
		return id
	else
		local preOperator = line - 1
		local operator = 4 * preOperator
		local formula = id - operator
		return formula
	end
end

print("Invoking for info")
local itemInfo = remote:InvokeServer()

wait(2.5)
print("Printing inventory info")
for i, v in pairs(itemInfo) do
	print(i,v)
	print("Creating information for panel")
	local lineNumber = i / 4
	local HorizontalId = checkHorizontalNumber(i, 1)
	local additional = HorizontalId - 1
	local additional2 = lineNumber - 1
	local Coordinate = UDim2.new(0, 135 * additional, 0, 135 % additional2)
	print("Obtaining information for item")
	local obtainedItemName, obtainedItemInfo = itemModule.GetItem(v)
	wait(0.5)
	if obtainedItemInfo then
		print("Information obtained")
		local itemTier = itemModule.TierValue(v)
		local targetPanel = panelHolder:FindFirstChild("Panel"..i)
		if targetPanel then
			print("Panel already exists")
			targetPanel.ToolName.Text = obtainedItemName
			targetPanel.Image.Image = "rbxassetid://"..obtainedItemInfo.image
			local assetToPreload = {targetPanel.Image}
			contentProvider:PreloadAsync(assetToPreload)
		else
			print("Creating new panel")
			local newPanel = panelHolder.Panel1:Clone()
			newPanel.Name = "Panel"..i
			newPanel.ToolName.Text = obtainedItemName
			newPanel.Position = Coordinate
			newPanel.Image.Image = "rbxassetid://"..obtainedItemInfo.image
			local assetToPreload = {newPanel.Image}
			contentProvider:PreloadAsync(assetToPreload)
		end
	end
	print("Ending function")
end

For the item library module:

local module = {}

local tableOfTier = {
	["Starter"] = 1; -- Receive when first joined the game
	["Common"] = 2; -- Can be obtained
	["Uncommon"] = 3; -- Can be obtained
	["Rare"] = 4; -- Can be obtained
	["Epic"] = 5; -- Can be obtained
	["Legendary"] = 6; -- Easily obtainable from the highest tier boxes
	["Mythical"] = 7; -- Insanely rare
	["Unobtainable"] = 8; -- The maximum tier you can get in a box
	["Exclusive"] = 9; -- Only limited to a group of people
	["???"] = 10; -- One in a kind
	
	-- Special Tiers
	["Event"] = 11; -- Obtained when you beat certain event
	["Achievement"] = 12; -- Obtained when beating achievements
	["Special"] = 13; -- Other special items, such as group items etc.
}

--Standard damage is 25, only really really insanely rare or a few of the selected weapon has bonus damage
local tableOfItem = {
	-- Types of reward: Gold, Item
	["Wood Club"] = {tier = "Starter";desc = "We might have stolen something from the local barbarians.";kind = "Weapon";dmg = 25;image = 2263279249};
	["Alpha Sword"] = {tier = "Special";desc = "For people who played during Alpha.";kind = "Weapon";dmg = 25;image = 2263279249};
	["Universal Sword"] = {tier = "???";desc = "The one and only mighty sword, created by WD32##:?#:##DE before universe even existed. Welded by only SpectrumDev himself. +Infinity damage";kind = "Weapon";dmg = 9001;image = 605035383}
}

function module.GetItem(itemName)
	print("Starting Module")
    for Objname, values in pairs(tableOfItem) do
	    if itemName == Objname then
		    return Objname, values
	    end
    end
end

function module.TierValue(tierName)
	for tier, value in pairs(tableOfTier) do
		if tier == tierName then
			return value
		end
	end
end

return module

Output: 1 Wood Club Creating information for panel Obtaining information for item Starting Module Information obtained Panel already exists 13:32:03.214 - ContentProvider:PreloadAsync() failed for rbxassetid://2263279249 Ending function 2 Alpha Sword Creating information for panel Obtaining information for item Starting Module Information obtained Creating new panel 13:32:03.748 - ContentProvider:PreloadAsync() failed for rbxassetid://2263279249 Ending function

Edit: I also need help with the ContentProvider preload async, I have no clue why it don't work.