What problem are you facing?

When presented with the payload below BSON.deserialize returns the wrong buffer value, payload.message as well as payload.attachments.[number].content are buffers, while payload.message returns the correct buffer for it, payload.attachments.[number].content on the other hand returns an empty buffer.

{
  "type": "message",
  "payload": {
    "message": "rs3PxIMZiwoLZn0+Jcdvmg==",
    "attachments": [
      {
        "name": "My Facebook Page.txt",
        "content": "T+lvSaFiCnv5c6+wngbR5yYY9Tf9xviZPSB7q3R67IU8PWBO8ia7RlaiKoEn4nltvtOR6N8/ZFdhvm2Q3fKyq1kYlnWLJyzPvi5Oe72/CKanlmJCjjFTKwMaoDmD8ffffQEAYz24vaZQaF1T+YNCdwC6DCspUgPMxy3QAwK5SrmYBSpaQ91jwvDViWqH61JTQVRVLSdlAcKmxMiNivJ/wEikD7EO"
      }
    ]
  }
}

EJSON does return the correct items, I could move to EJSON but it does feel bad to lose all the advantages BSON de-serialization provides.

What driver and relevant dependency versions are you using?

I'm using 6.1.0

Steps to reproduce?

The payload is provided above, I simply use BSON.deserialize.