The bug:

Upon bartering an item, if there are multiple Gold Bars (untested with other gold items) on the floor, the "Piglin snorts" and "Piglin admires item" sound effects play repeatedly.

How to reproduce:

1. Enter the nether
2. Locate a piglin and throw multiple gold bars onto the floor near it
3. After bartering, the piglin should start to repeat the sound effects

Unsure of the conditions, tried to reproduce on multiple occasions - only worked once.