Better Anti Dupe

[4.0.0] - 2026-07-13

Changed

• The plugin is now Better Anti Dupe. Same free plugin, new name — part of the ESMP rebrand. The project now lives at https://github.com/ESMP-FUN/BetterAntiDupe.
• Main command is /antidupe (aliases /adp, /betterantidupe). Permissions are unchanged (antidupe.*).
• Internal packages moved to com.esmpfun.antidupe.

Added

• Duper prevention. The classic block-duplication contraptions are now blocked at the mechanic level, before any item exists to track. Five new config toggles, all on by default:
  • prevent-rail-dupers / prevent-carpet-dupers — cancels piston movement that would dislodge a rail or carpet mid-move (including the carpet-on-piston-arm variant), the trick every rail/carpet duper relies on.
  • prevent-tnt-dupers — pistons can no longer move TNT blocks. Turn off if your server allows TNT-duper world eaters.
  • prevent-gravity-dupers — falling blocks (sand, gravel, concrete powder, dragon egg...) can no longer travel through portals (the end-portal sand duper family). Pistons pushing sand are unaffected.
  • prevent-container-desync-dupers — open container GUIs are force-closed when the container goes away (shulker/chest broken or blown up, donkey/chest-boat chunk unloading), killing the "phantom GUI" dupes that would otherwise launder items through legitimate-looking ledger entries.
• Death drops are now debited from the ledger. Previously, dying and re-collecting your items credited them a second time, permanently inflating the ledger — headroom a duper could farm by dying on purpose. Drops (including shulker contents) are debited at death and credited back on pickup, by whoever collects them.
• Automatic data-folder migration from plugins/AntiDupePro/ on first start (old folder kept as backup).

Fixed

• All 17 shulker box colors are tracked. The dyed variants were silently untracked despite the materials.yml comment claiming otherwise — only the undyed (purple) SHULKER_BOX was watched. Every color is now always tracked, as documented.
• Breaking your own filled shulker box no longer fires a false CRITICAL alert. The ledger treated items placed into a shulker as disposed, but the inventory scan counts items inside a held shulker as yours — so break-and-carry read as a huge surplus. Shulker/bundle contents now move on the ledger together with the container item, across pickups, drops, block placement, chest transfers, item frames, and decorated pots. Handing a friend a filled shulker via a chest also credits them the contents correctly.
• Ownership tags applied on pickup are now written back to the item entity explicitly, closing a potential gap on API versions where the stack getter returns a copy.