ItemCheck

Fixes

• Fixed a duplication bug that could happen when picking items up with a nearly-full inventory
• Fixed items sometimes losing their tracking ID after being dropped and picked back up
• Fixed ghost items appearing in the inventory after a blocked pickup, move, or craft
• Fixed stacked items losing their IDs when merged by hand or shift-click
• Fixed mass scan (/antidupe scan all) causing lag and occasional crashes on busy servers
• Fixed batch scan sometimes corrupting item data

Compatibility

• Now runs cleanly on 1.20 through 1.21.x+

Performance

• Improved pickup and stacking performance
• Reduced memory usage during long sessions
• Scans moved to a safer execution path to prevent server hitches