How to modify Mongoose array without strict: false?

Question

MongoDB

An incomprehensible situation. I get data from Monga I get an array with objects. Next, I need to modify each object in the array by adding a field to it. Seems like a simple task, but it doesn't work, the field is not added.
const tweets = await Tweet.find({author}).exec()

const proceedTweets = tweets.map(tweet => {
      Object.assign(tweet, {extra: 'stuff'})
      return tweet
    })

The array remains unchanged. Why is this happening and how can I modify the data received from the database?
ADF turned out Monguz does not return an ordinary array. There is an option to disable strict: false, but that doesn't work. What other options are there?
I just need to modify the search result in the database, and not the data itself in the database!

Answer 1

const proceedTweets = tweets.map(tweet => ({ ...tweet, extra: 'stuff' }));