Error restoring binary attribute

[rofr]

I have a table with a binary attribute with base64 encoded strings. When I backup with base64binary : true and then restore, I get a different value in the restored table.

If I backup with base64binary : false, the restore fails with an error:

{ InvalidParameterType: Expected params.RequestItems['dev-rental-events'][24].PutRequest.Item['body'].B to be a string, Buffer, Stream, Blob, or typed array object

The json in the backup (without base64binary) looks like:
{"createdAt":{"S":"2017-05-02T09:50:52.322Z"},"stream":{"S":"rental"},"id":{"S":"2017-05-02T09:50:52.317Z0"},"name":{"S":"register"},"body":{"B":{"type":"Buffer","data":[101,121,74,112,90,67,73,54,73,106,73,53,73,105,119,105,90,109,108,121,99,51,82,102,98,109,70]}}}

While the json with base64binary looks like:

{"createdAt":{"S":"2017-05-02T09:51:19.258Z"},"stream":{"S":"rental"},"id":{"S":"2017-05-02T09:51:19.257Z2"},"name":{"S":"lock-applicant"},"body":{"B":"ZXlKaGNIQnNhV05oYm5RaU9pSXlPU0lzSW1KeWIydGxjaUk2SWtGa1lXMGlMQ0owYVcxbGMzUmhiWEFpT2lJeU1ERTNMVEExTFRBeVZEQTVPalV4T2pFNUxqSTFOMW9pZlE9PQ=="}}
Note that the string value of the body above is the exact same string I see in the dynamodb ui.

[rofr]

worth noting, my app base64 encodes some stringified json and stores the result with a binary attribute. Probably really bad design but nonetheless, taking a backup and then restoring should result in identical tables