Islands uses server-side checks for item quantities. Scripts that only change values locally (client-side) create "ghost items" that disappear when you try to use or sell them.

: Design drop-chutes for Slimes or Buffacrystals to farm rare combat drops without active manual input. What to Do Next

Legitimate players who spent dozens of hours grinding bosses or managing automated farms found their efforts invalidated by exploiters who could generate the same resources in seconds. How the Developers Fixed the Exploit