Raycasting isn't working properly?

local tool = script.Parent
local player = game:GetService("Players").LocalPlayer
local Mouse = player:GetMouse()
Debounce = false
pressed = false
cancelled = false
canPress = false
 
tool.Equipped:connect(function(mouse)
	print("Tool equipped!")
 
	mouse.Button1Down:connect(function()
		print("Mouse pressed!")
		
		if Debounce == false then
				
			Debounce = true		
			
			local ray = Ray.new(tool.Handle.CFrame.p, (mouse.Hit.p - tool.Handle.CFrame.p).unit * 30)
			local part, position = workspace:FindPartOnRay(ray, player.Character, false, true)
		
			PreviewPart = script.Parent.Wooden_Floor:Clone()
			PreviewPart.Name = "Preview part"
			PreviewPart.Transparency = 0.5
			PreviewPart.Anchored = true
			PreviewPart.CanCollide = false
			PreviewPart.Position = position + Vector3.new(0, 0.375, 0)--  + Vector3.new(0,part.Size.Y/2,0)
			PreviewPart.Parent = workspace
			
			customBuild = Instance.new("Part")
			customBuild.Transparency = 1
			customBuild.Anchored = true
			customBuild.CanCollide = false
			customBuild.Name = "CustomBuild"
			customBuild.Parent = PreviewPart
		
			wait(1)
			
			canPress = true	
		end
	end)
end)

while wait() do
	if Debounce == true then

			Mouse.Button1Down:connect(function()
				if canPress == true then
					pressed = true
				end
			end)
			Mouse.Button2Down:connect(function()
				if canPress == true then
					cancelled = true
				end
			end)
			
		if cancelled == true then
			Debounce = false
			cancelled = false
			pressed = false
			canPress = false
			for i,v in pairs(workspace:GetChildren()) do
				if v.Name == "Preview part" then
					v:Destroy()
				end
			end
			print(cancelled)
		elseif pressed == true then
			Debounce = false
			cancelled = false
			pressed = false
			canPress = false
			for i,v in pairs(workspace:GetChildren()) do
				if v.Name == "Preview part" then
					v.Transparency = 0
					v.Name = "Floor"
					v.CanCollide = true
				end
			end
		end
		if PreviewPart ~= nil then
			local list = {player.Character,PreviewPart}
			local Player = game.Players:GetPlayers()
			local mouse = player:GetMouse()
			local ray = Ray.new(tool.Handle.CFrame.p, (mouse.Hit.p - tool.Handle.CFrame.p).unit * 30)
			local part, position = workspace:FindPartOnRayWithIgnoreList(ray, {player.Character,PreviewPart}, false, true)
			PreviewPart.Position = position --+ Vector3.new(0, 0.375, 0)
		end
	end
end

It gives no error (client) it works inside studio fine, the tool is inside replicatedstorage cloned and then putted inside the player, it doesn't go to your mouse position inside a real server, other parts work find.