TweenSizeAndPosition does not work on SurfaceGuis?

while base.Disp.SurfaceGui.Frame.TextLabel.Text=="Open" do
	local tl=Instance.new("TextLabel",base.Disp.SurfaceGui.Frame)
	tl.Size=UDim2.new(0,math.random(5,25),0,math.random(5,25))
	tl.Position=UDim2.new(.5,-tl.Size.X.Offset/2,.5,-tl.Size.Y.Offset/2)
	tl.ZIndex=0
	tl.Text=""
	tl.BackgroundColor3=Color3.new(math.random(0,255)/255,math.random(0,255)/255,math.random(0,255)/255)
	local randnum=math.random(15,75)/100
	tl:TweenSizeAndPosition(
		UDim2.new(0,0,0,0),
		UDim2.new(math.random(0,1000)/1000,0,math.random(0,1000)/1000,0),
		nil,
		nil,
		randnum
	)
	game.Debris:AddItem(tl,randnum+.6)
	wait(math.random(1,25)/100)
end

The gui just stays in the center, and does not shrink, but in Roblox Studio Play Solo, it works.