I will use an example :
Consider i am on the 6th item of my bar.
If I press '5' (to select the 5th item of the bar) and 'a' (to drop an item) at the same time, the 6th item will be dropped and the 5th one will disappear (if 5 is stackable, only one item will disappear).
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Thank you for your report!
We're actually already tracking this issue in MC-154881, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Confirmed, but the item selected at the time of the drop doesn't actually lose 1 item, it's just a visual bug. A disconnect/reconnect gives you back the lost item ^^