Mongodb – Mongoose – using findByIdAndUpdate – pushing an object into array pushes automatically id also in. Why?

When I update a document and push an object to an array (here below I push a new object containing info and date into the report array), an id is always being added and pushed into it. Why is that? Whats wrong in my code?

I create:

report: {
info: 'abc',
date:...,
_id: "'123'
}

but its suppose to be just:

report: {
info: 'abc',
date:...
}

const productSchema = new mongoose.Schema({
    name: { 
        type: String,
        required: true
    },
    hasReport: {
        type: Boolean
    },
    // if there is no reports, it will be an empty array, if there is i just push a new object into the array
    report: [{
        info: String,
        date: Date
    }],
}
mongoose.model('Product', productSchema);

updateProduct: async (req, res) => {
    const { id, hasReport, report: {info}} = req.body;
    const station = await Product.findByIdAndUpdate({_id: id}, {
           $push: {
               report: {
                   info: info,
                   date: new Date()
               },
           }, $set: {hasReport: true}})
    product.save()
}