Piglins admiring bartering gold ingot drop nothing when converting to Zombified Piglin

The bug

Piglins which admire a bartering gold ingot can convert to a Zombified Piglin in the Overworld, but drop neither the gold ingot nor the bartering result.

To be consistent with MC-133894, the gold ingot should be dropped.

How to reproduce

1. Summon a piglin in the Overworld
2. Wait about 18 seconds
3. Throw a gold ingot at it
   The piglin zombifies and the gold ingot is lost