Amazon Rekognition: When I create a new Stream Processor with S3Destination definition, this field is ignored

I followed the documentation https://docs.aws.amazon.com/rekognition/latest/APIReference/API_CreateStreamProcessor.html

Then I created a new Stream Processor from this JSON:

{
      Name: myStreamProcessor,
      Input: {
        KinesisVideoStream: {
          Arn: 'arn:aws:kinesisvideo:eu-west-1:xxxxxxxxxxxx:stream/test-video-stream/xxxxxxxxxxxx'
        }
      },
      Output: {
        KinesisDataStream: {
          Arn: 'arn:aws:kinesis:eu-west-1:xxxxxxxxxxxx:stream/ds-video-rekognition-test'
        },
        S3Destination: {
          Bucket: 'matched-faces-test-bucket'
        }
      },
      RoleArn: 'arn:aws:iam::xxxxxxxxxxxx:role/recognition-stream-processor-test',
      Settings: {
        FaceSearch: {
          CollectionId: 'test-faces-test',
          FaceMatchThreshold: 85.5
        }
      }
    };

But when I describe the Stream Processor:

....
  Output: {
    KinesisDataStream: {
      Arn: 'arn:aws:kinesis:eu-west-1:570379525661:stream/ds-video-rekognition-unai'
    },
    S3Destination: undefined
  },
....

S3Destination is undefined!🤷🤷🤷

I tried with aws-cli and with aws-skd for JavaScript with the same result.

Thanks,