I write a sample test on: https://github.com/GaoJianAllen/MongoTest

When use sort method to sort fields, it will return wrong sort result sometime.

Key code:

cursor, err := coll.Find(context.TODO(), bson.M{}, options.Find().SetSort(
   bson.M{"type": 1, "created": -1}))

Expect:

Actual(Sometimes):

Command is always correct.

db.coll.find().sort({"type": 1, "created_at":-1})