Same problem, which is sad, because 4 poles per grid is really useful to avoid signal conflicts.
A workaround is to right click the blueprint, click "Export as String", then select "Import string" from the shortcut bar at the bottom, paste, and import. That imported blueprint will have the wires. Downside (beyond having to do it this cumbersome way) is that you get a new blueprint in your inventory every time.. But it works.