Does Viewport frame not work on SurfaceGui?

i put this code on a "Script" inside SurfaceGui:

local viewportFrame = Instance.new("ViewportFrame")
viewportFrame.Size = UDim2.new(1, 0, 1, 0)
viewportFrame.Position = UDim2.new(0, 15, 0, 15)
viewportFrame.BackgroundColor3 = Color3.new(0, 0, 0)
viewportFrame.BorderColor3 = Color3.new(0.6, 0.5, 0.4)
viewportFrame.BorderSizePixel = 2
viewportFrame.BackgroundTransparency = 0.25
viewportFrame.Parent = script.Parent
local part = Instance.new("Part")
part.Material = Enum.Material.Concrete
part.BrickColor = BrickColor.new("Bright blue")
part.Position = Vector3.new(0,0,0)
part.Parent = viewportFrame

local viewportCamera = Instance.new("Camera")
viewportFrame.CurrentCamera = viewportCamera
viewportCamera.Parent = viewportFrame

viewportCamera.CFrame = CFrame.new(Vector3.new(0,2,12), part.Position)

it doesn't work.

however when I converted it to "Localscript" and put it on on ScreenGui, it works perfectly fine.

hmm...