MongoDB v4.4

Node.js driver: 3.6.6

As i know, find query don't compete race condition. but i don't know why?

// 코드 자리 표시자
const session = Connection.client.startSession();
    try {      session.startTransaction();      const result = await Promise.all([        Connection.db.collection("movies").findOne(          {            genres: { $in: ["Drama"] },          },          { session }        ),        Connection.db.collection("movies").findOne(          {            genres: { $in: ["Fantasy"] },          },          { session }        ),        Connection.db.collection("movies").findOne(          {            genres: { $in: ["Crime"] },          },          { session }        ),      ]);      await session.commitTransaction();      res.status(200).send(result);    } catch (error) {      console.log(error);
      await session.abortTransaction();      // console.log(abort);
      res.status(500).send(error.message);    } finally {      session.endSession();    }

MongoError: Given transaction number 3 does not match any in-progress transactions. The active transaction number is 2
at Connection.<anonymous> (/Users/ian/Workspace/my/mongodb-transaction-test/node_modules/mongodb/lib/core/connection/pool.js:451:61)
at Connection.emit (events.js:315:20)
at Connection.EventEmitter.emit (domain.js:467:12)
at processMessage (/Users/ian/Workspace/my/mongodb-transaction-test/node_modules/mongodb/lib/core/connection/connection.js:451:10)
at TLSSocket.<anonymous> (/Users/ian/Workspace/my/mongodb-transaction-test/node_modules/mongodb/lib/core/connection/connection.js:620:15)
at TLSSocket.emit (events.js:315:20)
at TLSSocket.EventEmitter.emit (domain.js:467:12)
at addChunk (internal/streams/readable.js:309:12)
at readableAddChunk (internal/streams/readable.js:284:9)
at TLSSocket.Readable.push (internal/streams/readable.js:223:10)

,
ok: 0,
code: 251,
codeName: 'NoSuchTransaction',
'$clusterTime':

,
signature: { hash: [Binary], keyId: [Long] }
},
[Symbol(errorLabels)]: Set(1) { 'TransientTransactionError' }
}