[Bug]: nl property not working in react project

[NexonTreeHouse]

MQTTjs Version

5.0

Broker

mosquitto

Environment

Browser

Description

Setting the nl flag to true still allows the receipt of published messages from the same client. However, other MQTT connections (using Paho Rust) to the same broker do not encounter this issue. A minimal React component recreation below demonstrates this behavior, however, I am just using this client in react, however, I don't see any reason this would be a react specific issue.

Minimal Reproduction

create a react project and use the component below.

"use client"

export default function Home() {
  const [messages, setMessages] = React.useState<string[]>([]);
  const [client, setClient] = React.useState<mqtt.MqttClient | null>(null);
  useEffect(() => {
    const client = mqtt.connect({
      host: "localhost",
      defaultProtocol: "ws",
      port: 9001,
      protocolVersion: 5,
    });

    client.on("connect", () => {
      setClient(client);
    });

    client.subscribe("testtopic/#", {
      nl: true,
      properties: {},
    });

    client.on("message", (topic, message) => {
      console.log("message", topic, message.toString());
      setMessages((messages) => [...messages, message.toString()]);
    });
  }, []);

  return (
    <div>
      <button
        onClick={() => {
          if (client) {
            client.publish("testtopic/1", "Hello World", {
              qos: 2,
            });
          }
        }}
      >
        Send Message
      </button>
      <pre>{JSON.stringify(messages, null, 2)}</pre>
    </div>
  );
}

Debug logs

no logs in browser console

[robertsLando]

If the packet is received by client it means the broker is sending this to him so could be that for some reason the nl flag is not respected by broker or mqttjs is not econding it correctly in the packet.