Product not updating – Mongoose MongoDB

I am unable to update and save a change in the database using mongoose. I am getting the same value for foundProduct twice when I console.log. What could be going wrong?

// Schema
const productSchema = new mongoose.Schema(
    {
        name: {
            type: String,
            required: true,
        },
        price: {
            type: Number,
            required: true,
        },
        onSale: {
            type: Boolean,
            default: false,
        },
    }
)

// model
const Product = mongoose.model('Product', productSchema)

const findProduct = async () => {
    const foundProduct = await Product.findOne({ name: 'Mountain Bike' });
    console.log(foundProduct)
    foundProduct.OnSale = true;
    await foundProduct.save().then((data) => console.log(data))
    // console.log(foundProduct)
}

findProduct();