[MC-172356] Piglin admiring held gold ingot drops it when killed

The bug

As shown here: Costless Bartering In Snapshot 20w07a

When bartering with a piglin it instantly throws the result but then continues to admire the gold ingot. However when it is killed while admiring the gold ingot, the ingot is dropped, therefore allowing bartering without actually paying anything.

How to reproduce

Summon a piglin with low health
```
/summon piglin ~ ~ ~ {Health:0.1f}
```
Right click it with a gold ingot
It throws an item at you
Kill it while it is still admiring the gold ingot
It drops the gold ingot