TraceListener not work

[ctlove0523]

Version: 4.1.2
configure:

spring:
  cloud:
    bus:
      enabled: true
      id: MSGSMS:OMP:AMService:${VM_IP:${random.uuid}}
      trace:
        enabled: true
      ack:
        enabled: true

HttpExchangeRepository：

@Component
public class LogEventTraceRepository implements HttpExchangeRepository {
    private static final Logger log = LoggerFactory.getLogger(LogEventTraceRepository.class);

    private List<HttpExchange> traces = new ArrayList<>();


    @Override
    public List<HttpExchange> findAll() {
        return new ArrayList<>(traces);
    }

    @Override
    public void add(HttpExchange httpExchange) {
        traces.add(httpExchange);
        log.info("traces is {}", httpExchange);
    }

}

but when i define a AckRemoteApplicationEvent listener,it works well：

@Component
public class AckListener {

    @EventListener
    public void onApplicationEvent(AckRemoteApplicationEvent event) {
        System.out.println("get ack event " + event.getOriginService());
    }
}

how can i make trace listener works well