I’ll re-inspect the header’s terminal identities and net connectivity to confirm whether the 40 pads still collapse into one electrical net.

Rechecked the part project: all 40 schematic terminals and PCB pads now have unique identifiers 1–40; they are no longer represented as a shared ~ pin. There are no nets in this part project, so multi-net behavior must be confirmed in a consuming schematic by refreshing/replacing the existing header instance—older instances may retain the previous broken pin mapping.