Villagers trades doesn't work!

Hi,
I'm trying to make some custom trades with a villager, but it seems that the trades aren't available (like after a certain amount of trades, they're blocked). I'm working on 1.16.4.

Could you help me ?
Thanks!

there is my code, in case of

Code:

public static void addTrade(Villager villager, TradesUtils villagerTrade) {
        EntityVillager entityVillager = ((CraftVillager)villager).getHandle();
        entityVillager.setSilent(true);
        MerchantRecipeList list = entityVillager.getOffers();
        ItemStack item1;
        ItemStack item2;
        if (TradesUtils.hasItem2(villagerTrade)) {
            item1 = CraftItemStack.asNMSCopy(TradesUtils.getItem1(villagerTrade));
            item2 = CraftItemStack.asNMSCopy(TradesUtils.getItem2(villagerTrade));
            ItemStack rewardItem = CraftItemStack.asNMSCopy(TradesUtils.getRewardItem(villagerTrade));
            list.add(new MerchantRecipe(item1, item2, rewardItem, 0, 99999, 0f));
        } else {
            item1 = CraftItemStack.asNMSCopy(TradesUtils.getItem1(villagerTrade));
            item2 = CraftItemStack.asNMSCopy(TradesUtils.getRewardItem(villagerTrade));
            list.add(new MerchantRecipe(item1, item2, 0, 99999, 0f));
        }
    }

 

Thats normal? Trades normally get blocked after a certain amount of trades