Client-side desyncs can occur when dropping items and switching them into your offhand simultaneously

The Bug:

Client-side desyncs can occur when dropping items and switching them into your offhand simultaneously.

Steps to Reproduce:

1. Obtain a stack of dirt and hold it in your main hand.
2. Press the "Drop Selected Item" key at the same time as the "Swap Item With Offhand" key.
3. Take note as to whether or not client-side desyncs can occur when dropping items and switching them into your offhand simultaneously.

Observed Behavior:

Client-side desyncs can occur.

Expected Behavior:

No client-side desyncs would occur.