More selections arrow disappears for last item

The arrow indicating that there are more items that can be selected of a given type disappears when you select the last item in the list of options
More selections arrow disappears for last item

This might be intended, as to show you that you have "better"/higher tier options available,
rather than a indication that you have options.

Not sure if it is a good indication. I don't need the highest tier of pipe/conveyor everywhere. If machine accepts less than 60/60 then I use T1.

Yeah, I do the same; I'm just saying that maybe the current behaviour is intended anyway.

well, yes, maybe. Additionally, it is usually faster to copy a pipe/conveyor rather finding it in the menu.