Tool disappears after using for 5 seconds in online, but not in studio?

I have the tool, that when you use it it shoots a laser beam.

The code is in a local script, which is in the tool. The tool is welded correctly and whatnot.

This only happens with online mode. Note -- I have filtering enabled on.

code:

local tool = script.Parent
local player = game:GetService("Players").LocalPlayer

tool.Equipped:connect(function(mouse)
	mouse.Button1Down:connect(function()
		local ray = Ray.new(tool.Handle.CFrame.p, (mouse.Hit.p - tool.Handle.CFrame.p).unit * 300)
		local part, position = workspace:FindPartOnRay(ray, player.Character, false, true)
		local beam = Instance.new("Part", workspace)
			beam.BrickColor = BrickColor.new("Bright red")
			beam.FormFactor = "Custom"
			beam.Material = "Neon"
			beam.Transparency = 0.15
			beam.Anchored = true
			beam.Locked = true
			beam.CanCollide = false
		local distance = (tool.Handle.CFrame.p - position).magnitude
		beam.Size = Vector3.new(0.3,0.3,distance)
		beam.CFrame = CFrame.new(tool.Handle.CFrame.p, position) * CFrame.new(0,0, -distance / 2)
		game:GetService("Debris"):AddItem(beam, 1)
		if part then
			local humanoid = part.Parent:FindFirstChild("Humanoid")
			if not humanoid then
				humanoid = part.Parent.Parent:FindFirstChild("Humanoid")
			end
			if humanoid then
				humanoid:TakeDamage(25)
			end
		end
	end)
end)

This is mainly just taken off the wiki when I was learning about rays and stuff.

What am I doing wrong?