The second ingredient in trades can no longer be removed using `MerchantRecipe.removeIngredient(1)` or `MerchantRecipe.setIngredients(...)`.

Sample code:
    @EventHandler
    public void onAcquireTrade(VillagerAcquireTradeEvent event) {
        event.getRecipe().setIngredients(List.of(new ItemStack(Material.STICK, 12), new ItemStack(Material.EMERALD, 1)));
        AbstractVillager villager = event.getEntity();
        Bukkit.getScheduler().runTaskLater(BugReport.getPlugin(BugReport.class), () -> {
            for (int i = 0; i < villager.getRecipeCount(); i++) {
                MerchantRecipe recipe = villager.getRecipe;
                getLogger().info("Ingredients: " + recipe.getIngredients());
                // also doesn't work
//                if (recipe.getIngredients().size() > 1)
//                    recipe.removeIngredient(1);
                recipe.setIngredients(List.of(new ItemStack(Material.OAK_LOG, 11)));
                villager.setRecipe(i, recipe);
        }, 1);
Expected behavior: ingredient 1 will be empty
Actual behavior: ingredient 1 is still an emerald