Offline items in the level still generate property setters in a script blob

[Stranger1992]

As discussed on Discord #1144 which threw an error:

[2026-Mar-08 21:58:43] [error] A Lua error occurred while running a level; DoFlow: [string "-- Auto-generated property a..."]:11: attempt to index a nil value
stack traceback:
..."]:11: in main chunko-generated property assignment script