Hi, first off very cool mod, helps a ton with my circuit mall. Second if you hide all the wires and proceed to upgrade a building it will delete all the connections. For example if you had a connected steel chest and you upgrade it to provider chest by placing it on top of one another when the wires are hidden, all the connected wires will be deleted.

That's interesting, thanks for the report. It must be that some base game behaviour only checks for player built wires, which makes sense, but makes this mod less trivial. I'll look into it.