EJB @Timeout method is called twice after hot re-deploy in JBoss EAP 6

Issue

• We have the following simple app: one @Singleton bean with @Timeout method and one servlet which starts timer. After first deploy we see that method is called once in 2 seconds - which is expected. Then after hot re-deploy we see that method is called twice within 2 seconds. After a few redeploys method is called multiple times during the same 2 seconds. Restarting the server doesn't help. See the code below:

EJB Timer code:

import javax.ejb.*;

@Remote(TimerRemote.class)
@Singleton
public class TimerBean implements TimerRemote {
  @Resource
  private SessionContext context;

  public void startTimer() {
    context.getTimerService().createTimer(2000,2000,null);    
  }

  @Timeout
  public void timeoutCallback(javax.ejb.Timer timer) {
    System.out.println("timeoutCallback is called: " + timer);
  }
}

public interface Timer {
    public void startTimer();
}

Servlet code that calls the EJB to start the timer:

public class TestServlet extends HttpServlet {
  @EJB 
  private Timer timer;

  public void init() {
    System.out.println("init timer");
    timer.startTimer();
  }
}