Dropping an item from your hotbar at the same time as switching to another hotbar slot desyncs the second item

A desync occurs when dropping your held item and swapping to another inventory slot at the same time.

Steps to reproduce:

1. Populate at least two hotbar slots with items, I recommend the one you're switching to being one near your drop button.
2. While holding an item in your hand (selected in the hotbar), hit the drop button AND the button to switch to another hotbar slot at the same time. (i.e. 'Q' + '1').
3. If done correctly, which seems relatively common, the item in your switched-to hotbar slot disappears, while the item you switched from drops as expected.
4. The item in your switched-to slot will reappear if you open your inventory and click it, as with most ghost blocks/items.

Interestingly, if your ghosted item is a pickaxe, you can mine stone at normal punching speed, but still get the drop as if you used the pickaxe. This DOES consume durability as expected.