you can copy any item

Bug Summary
When pressing both a hotbar slot key (1-9) and the drop key (default Q) while holding any item in the main hand, the player obtains a duplicated item with abnormal behavior. This duplicated item exhibits multiple inconsistencies compared to legitimate items.

Steps to Reproduce

1. Hold any item in main hand (e.g. Diamond Pickaxe)

2. Simultaneously press:

   • A hotbar slot number key (1-9)

   • The drop key (Q)

3. Observe duplicated item behavior

Actual Results
The duplicated item exhibits these properties:

1. Mining Mechanics

   • Displays original item's mining speed in tooltip, but actual mining speed matches bare hands

   • Causes multi-block destruction (same block breaks repeatedly)

2. Combat Mechanics

   • Shows original item's attack speed in tooltip, but actual:

     • Attack speed = bare hands

     • Damage = bare hands

3. Inventory Behavior

   • Cannot be placed in containers (disappears when opening GUI)

   • Disappears instantly when:

     • Dropped

     • Right-click interactions

   • Never consumes durability

   • Survival Mode: Disappears when moved in inventory GUI

   • Creative Mode: Transforms into legitimate original item

4. Slot Conflicts

   • If original item is picked up while duplicated item occupies its preferred slot, the duplicated item disappears

5. Multiplayer Specifics

   • Other players can collect original dropped items, but duplicated items:

     • Disappear immediately when dropped

     • Cannot be picked up by other players

6. Off-hand Restrictions

   • Cannot be placed in off-hand via "F" key

   • Original items can still be placed in off-hand normally

7. Slot Overwrite Behavior

   • If target hotbar slot contains another item when triggering bug:

     • Duplicated item inherits all NBT/data of slot item (except visual appearance/hover text)

     • Transforms into slot item when disappearing

Expected Results

1. Hotbar switching should not create item duplicates

2. All items should maintain consistent gameplay properties as displayed

3. Inventory interactions should follow standard item behavior

Additional Notes

• Reproduction rate: 100% replicable in both Singleplayer and Multiplayer

• Client-side prediction appears to cause discrepancy between displayed and actual item properties

This report was translated by Deepseek, and the wording may not be completely accurate, but I also do not speak English./:p