Piglin bartering is limited to dropping a single item stack from the loot table

The bug

When modifying the bartering loot table to drop multiple (different items), only the first item is dropped.

How to reproduce

1. Enable the attached datapack, which replaces the bartering loot table with a loot table that drops stone and dirt
2. Barter with a piglin -> it'll only give the dirt.

Code analysis

When looking at the decompiled code using Mojang's mappings, PiglinAI.getBarterResponseItem only returns the first entry of the ItemStack list.