MongoDB: create() is duplicate document with indexed id?

Question

I have a syntax MongoDB create() function below:

const create = async (info, opts = {}) => {
  const data = await Model.create(info, opts);
  return data;
};

And when I pass that info argument with object type {} and MongoDB will create 1 more document:

I tried to pass this info argument with the following syntax: [{}] ==> The problem is solved. But I still cant understand why ??? Could someone please tell me the reason for this problems. Many thanks!!!

This is my Schema definition:

const MarketOrder = new Schema ({
  id: { type: String, default: uuidV4, unique: true, index: true },
  buyer: {type: String},
  seller: {type: String},
  type: { type: String, enum: ["NFT"] },
  object: { type: String, refPath: "objectModel" },
  objectModel: {
    type: String,
    //required: true,
    enum: [
      "market.nft",
      //"user.nft.sets",
      //"market.creator",
    ],
  },
  number: {type: Number},
  price: {type: Number},
  collectionAddrs: [{type: String}],
  tokenIds: [{type: String}],
  marketSig: {type: String},
  txHash: {type: String},
  status: {type: String}
},
{
  timestampe: true
});