Icons for products at the end of unconnected pipes/conveyor belts.

When you are designing or placing a layout, you can see icons for product in the inputs and outputs of the machines, but if you add a single piece of pipe or conveyor belt, the icon disappear. It would be great to see the icon at the end of unconnected pipe or conveyor belt. Sometimes, when the layout is complicated, it's difficult to follow pipes (like in diesel refineries), especially in design mode.