Query.sort not working since 5.12.11

[ymshenyu]

Do you want to request a feature or report a bug?
A bug (might be relevant to mongodb/node-mongodb-native#2790).
What is the current behavior?

5.12.10

[
    {
        "_id": "60dd3b60ee6dcc3702d26cba",
        "createDate": "2021-07-01T03:49:52.593Z",
    },
    {
        "_id": "60dd39cdee6dcc3702d26bd3",
        "createDate": "2021-07-01T03:43:09.566Z",
    },
]

5.12.11+

[
    {
        "_id": "60d94bc55e6194df53f70b37",
        "createDate": "2021-06-28T04:10:45.484Z",
    },
    {
        "_id": "60d94dda5e6194df53f70c18",
        "createDate": "2021-06-28T04:19:38.419Z",
    },
]

You can see mongoose return unsorted document array.

If the current behavior is a bug, please provide the steps to reproduce.

   // Model creation
   const schema = new mongoose.Schema({
             createDate: {
                       type: Date,
                       index: true
             }
   })
   const Model = mongoose.model('data', schema)
   
   // Operation
   const data = await Model.find().sort({ createDate: -1 })
   console.log(data)

What is the expected behavior?
Return sorted document array.
What are the versions of Node.js, Mongoose and MongoDB you are using? Note that "latest" is not a version.
Node: 16.4.2
Mongoose: 5.13.2
MongoDB: 4.2.10 Community

[IslandRhythms]

const mongoose = require('mongoose');

   // Model creation
   const schema = new mongoose.Schema({
    createDate: {
              type: Date,
              index: true
    }
})
const Model = mongoose.model('data', schema)


async function run() {
    await mongoose.connect('mongodb://localhost:27017/test', {
        useNewUrlParser: true,
        useUnifiedTopology: true,
      })
    
      await mongoose.connection.dropDatabase()
// Operation
await Model.create({createDate: new Date()});
await Model.create({createDate: new Date()});
await Model.create({createDate: new Date()});
console.log('Unsorted', await Model.find());
const data = await Model.find().sort({ createDate: -1 })
console.log('Sorted', data)
}

run();

[ymshenyu]

Thanks for your help. Indeed, this wasn't a bug for mongoose. Sorry for bothering you.