RCD Silo Connection Upgrade Does Not Work Properly on Multi-Z Maps

[Ikalpo]

Round ID: NAN

Testmerges: NULL

Reproduction:

get an /obj/item/rcd_upgrade/silo_link and plug it into an RCD.
the feature will only work on the same Z level as the ore silo, when it should work anywhere on the ship. (and probably on docked craft too)