KV/stream republished messages do not propagate to MQTT subscriptions

[bruth]

Defect

Make sure that these boxes are checked before submitting your issue -- thank you!

• Included nats-server -DV output
• Included a [Minimal, Complete, and Verifiable example] (https://stackoverflow.com/help/mcve)

Versions of nats-server and affected client libraries used:

2.9.19, main, and dev

OS/Container environment:

macOS

Steps or code to reproduce the issue:

Start server with MQTT enabled"

server_name: test
jetstream: enabled
mqtt: {
  port: 1883
}

Define a KV bucket with republish configured:

nats kv add config --republish-source='$KV.config.>' --republish-destination='mqtt.config.>'

Start an MQTT client subscription on mqtt/config/# (I used the HiveMQ MQTT CLI), e.g.

mqtt sub -V 3 -t "mqtt/config/#"

Put a key-value pair to the bucket.

nats kv put "device.1" '{"state": "on"}'

Expected result:

The MQTT client receives a message.

Actual result:

It does not.

Note

Starting a NATS sub on mqtt.config.> will result in the message being received, so the republish works, but for some reason, it does not appear to propagate to the MQTT subsystem.