The bug

Items were thrown from an opening container lost the Thrower NBT tag.

How to reproduce

Updated to 1.17.1 (attached video is in an old version).

1. Throw an item.
2. Fill up your inventory with other items.
3. Open your inventory (or other containers).
4. Select an item with your cursor.
5. Make sure your inventory is maxed out by picking up the item on the ground, then use the Esc key to close the inventory (without putting the item down), you will throw an item out.
6. Run the command below.

   /data get entity @e[type=item,sort=nearest,limit=1] Thrower

   The UUID information of the thrower should be output under correct circumstances, but it says Found no elements matching Thrower.