addInboundMessageListener on ChatRoom not working since upgrade from 0.7.4

[kremit]

I've recently upgraded an internal project that used babbler 0.7.4 (Java 8) to 0.9.1 (Java 11) with maven.
It uses MUC with a conference room, and previously I was using ChatRoom.addInboundMessageListener.
It seems this listener is no longer firing in 0.9.1. If I change it to xmppSession.addInboundMessageListener, it works, and luckily it's only joined to a single room, so the global listener works fine with the rest of our code.

TcpConnectionConfiguration tcpConfiguration = TcpConnectionConfiguration.builder()
		.hostname(NWWSHost)
		.port(5223)
		.channelEncryption(ChannelEncryption.OPTIONAL)
		.connector(new SocketConnector(createTrustAllSslSocketFactory()))
		.keepAliveInterval(Duration.ofSeconds(60))
		.build();

XmppSessionConfiguration sessionConfiguration = XmppSessionConfiguration.builder()
		//						.debugger(ConsoleDebugger.class)
		.reconnectionStrategy(ReconnectionStrategy.truncatedBinaryExponentialBackoffStrategy(10, 3))
		.defaultResponseTimeout(Duration.ofMillis(5000))
		.extensions(Extension.of(NWWSMessage.class))
		.build();

XmppClient xmppSession = XmppClient.create(NWWSHost, sessionConfiguration, tcpConfiguration);

xmppSession.addConnectionListener(e -> {
	if(e.getType() == ConnectionEvent.Type.RECONNECTION_SUCCEEDED) {
		System.out.println("Connection status: CONNECTED (reconnect succeeded)");
	} else if(e.getType() == ConnectionEvent.Type.DISCONNECTED) {
		System.out.println("Connection status: DISCONNECTED");
	}
});

// Connect
xmppSession.connect();
// Login
try {
	xmppSession.login(NWWSUser, NWWSPass, "nwws");
} catch (AuthenticationException e) {
	// Login failed, because the server returned a SASL failure, most likely due to wrong credentials.
	e.printStackTrace();
} catch (XmppException e) {
	// Other causes, e.g. no response, failure during resource binding, etc.
	e.printStackTrace();
}

MultiUserChatManager multiUserChatManager = xmppSession.getManager(MultiUserChatManager.class);
ChatService chatService = multiUserChatManager.createChatService(Jid.of("conference." + xmppSession.getDomain()));
ChatRoom chatRoom = chatService.createRoom("nwws");

chatRoom.addOccupantListener(e -> {
	System.out.println("test occupant");
});
chatRoom.addOccupantListener(e -> {
	if (e.getType() == OccupantEvent.Type.ENTERED) {
		System.out.println(e.getOccupant().getNick() + " has entered the room");
	}
});

chatRoom.addInboundMessageListener(inMsg -> {
	Message rawStanza = inMsg.getMessage();
	// Handle message
	//System.out.println(rawStanza.getBody());
	NWWSMessage alertMsg = rawStanza.getExtension(NWWSMessage.class);
//...
});

note that the chatRoom.addOccupantListener is also not working with 0.9.1.

The fix at least for the inbound messages was to change the line to:

xmppSession.addInboundMessageListener(inMsg -> {

The full code is in a private repo, but I'm happy to share access to it if you want to see the full project.