Holding a item with your mouse, then press X to close minecraft. ITEM GONE

Put the summary of the bug you're having here
Holding a item in your mouse, then press X to close minecraft. ITEM GONE

What I expected to happen was...:
Describe what you thought should happen here: Holding item and pressing X for close minecraft, log in again then the item is gone.

What actually happened was...:
Describe what happened here: Holding item and pressing X for close minecraft, log in again then the item is gone.

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...Go to crafting bench then hold a item with your mouse
3. ...Then press X to close minecraft WITH THE ITEM IN YOUR HAND. Log in again at the same world then the item is GONE.