Hello. I am having the same issue here. Player 1 grand design works fine. Player 2, however, wires don’t show up. You can see previously placed wire, but not the ones player 2 used. If player 2 used a normal wrench, it works fine. But grand design, no.
I just spent over an hour pulling my hair out over this. THANK YOU! This is absolutely an issue, the grand design is completely broken for player two in split screen on console. I’m on Xbox One. I’ll be making a report to the devs.