Steps to reproduce

1. Toss a gold ingot to a piglin.
2. Save & quit.
3. Reload the world.

Expected result

Piglin finishes bartering: it puts away the gold ingot and tosses you some other items.

Observed result

Piglin perpetually holds the gold ingot in its offhand. If it zombifies, then the zombified piglin continues to hold the gold ingot in its offhand.

If you save and exit while a piglins is looking at gold, when you return the piglin will be holding the gold but will be unable to trade with. (World type: Easy, no cheats enabled)