inconsistant "rollover" infos between layers

I just notice a strange thing.

While building a room, and switching to the plumbing overlay, first thing I notice is that the ghost of the pipes don't show what they need when we put the mouse over a section not allready constructed.

On the screen, my mouse is over one of the pipe I ask to build.Same thing happens in the ventilation overlay, but not in the power overlay.

And in the power overlay, the gas info appears only when roll over a wire (build or not).

It's not very consistent

Another thing I notice is that, as you can see above, we don't have gas infos in the plumbing overlay (which is normal in my opinion)

But we can see it in the ventilation and power overlays. Which is of no use, because we look at the pipe or wire content, not the surrounding gas.

Vesta.sav