RejectCollect is not called on CreateContents or other forced entry methods but should still cause the lantern to attach. So move any side-effects to Collection2 instead of direct RejectCollect.
The lantern dummy had Timer=1 and wasn't doing anything. Use a simple overlay instead.
Note that interaction menus still show the lantern always with off-material. But that's a bug in the interaction menu.
Reworked the lantern and buildings to use the libraries.
Lamp Post: Included by buildings if lamps should hang outside.
Lamp: Included by lamps!
Lamp Dummy: Included by the dummy object that resembles the (outisde) hanging lamp.
Maikel de Vries