Correct Usage of AWS IoT Propagating Attributes

Goal: I'm attempting to use propagating attributes with AWS IoT. My final goal is to use these attributes to redirect messages to a new topic based on an attribute on the thing (an organization ID in this case).

Background:

• I have a "Thing Type" called "Meter". It has a searchable attribute called "organization" and has propagating attributes set up to propagate it (I think) - see Figure A.
• I have a thing called "test-thing" whose thing type is also set to "Meter", and it has the "organization" attribute set to a value (see Figure B).
• I have a test script that updates the shadow of "test-thing" every 5 seconds with a new value using MQTT 3 - see Code A

Assumptions

• I can use MQTT 3 or MQTT 5 on my device to publish shadow updates, and messages should still propagate attributes. The documentation indicates that while subscribers must support MQTT 5, publishers may use any MQTT version
• The propagated values should appear in the "Properties" of an MQTT message and are viewable in the MQTT Test Client within the AWS Console. This does not happen

What I would expect: See the "organization" key and its value (as set on the specific thing) listed under "User Properties" within the "Properties" in the MQTT test client in the console when the device publishes shadow updates to $aws/things/THING_NAME/shadow/name/SHADOW_NAME/update/accepted. Furthermore, this property would be accessible via the get_user_properties function within a rule so that messages can be dynamically routed/republished based on that value.

Figure A

Figure B

Code A

import { mqtt, iotshadow, iot } from 'aws-iot-device-sdk-v2'
import { Resource } from 'sst'

const thingName = 'test-thing'
const endpoint = "REDACTED" // endpoint address

console.log('building connection')
const config_builder = iot.AwsIotMqttConnectionConfigBuilder.new_mtls_builder_from_path(
  './mocks/certificates/cert.pem',
  './mocks/certificates/key.pem',
)
config_builder.with_clean_session(false)
config_builder.with_client_id(thingName)
config_builder.with_endpoint(endpoint)

const config = config_builder.build()

const client = new mqtt.MqttClient()

console.log('connecting...')
const connection = client.new_connection(config)

const shadowClient = new iotshadow.IotShadowClient(connection)

connection.on('connect', async () => {
  console.log('Connected to AWS IoT Core')
})

connection.on('disconnect', () => {
  console.log('Disconnected from AWS IoT Core')
})

connection.on('error', (error) => {
  console.error('Connection error:', error)
})

await connection.connect()

let value = 0
while (true) {
  await shadowClient.publishUpdateNamedShadow(
    {
      thingName,
      shadowName: 'state',
      state: {
        reported: {
          value: value,
        },
      },
    },
    0,
  )
  console.log('Published shadow update:', { value })

  value++

  await new Promise((resolve) => setTimeout(resolve, 5000))
}