'When upsert a document in mongodb(nodejs), and upsertedCount > 0, how can I make the upsertedId not null?

When I use updateOne({ _id: profile._id }, {$set: profile}, { upsert: true }), the returned result is

result= {
  acknowledged: true,
  modifiedCount: 0,
  upsertedId: null,
  upsertedCount: 1,
  matchedCount: 0
}

And it inserts a document with _id=null, I want to use the auto-generated _id but don't want it to be null, what do I need to do?

node.js mongodb

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