ThreadMode.ASYNC executes in one thread only

Thanks for the great library! However something is bothering me. I am posting a message to three different methods, each has its own tag and they are set to ThreadMode.ASYNC. However they do not execute in parallel, but sequentially.

EventBus.getDefault().post(7, "test1");
EventBus.getDefault().post(7, "test2");
EventBus.getDefault().post(7, "test3");

@Subscriber(tag = "test1", mode = ThreadMode.ASYNC)
public void test1(int request){
    ...
}
...

Logcat:
04-21 23:15:19.835 E/test1﹕ Working on a task
04-21 23:15:20.936 E/test1﹕ Done -2134183543
04-21 23:15:20.936 E/test2﹕ Working on a task
04-21 23:15:22.247 E/test2﹕ Done -2134183543
04-21 23:15:22.247 E/test3﹕ Working on a task
04-21 23:15:23.058 E/test3﹕ Done -2134183543

Expected something like this:
04-21 1.1 E/test1﹕ Working on a task
04-21 1.2 E/test2﹕ Working on a task
04-21 1.3 E/test3﹕ Working on a task
04-21 2.1 E/test1﹕ Done -2134183543
04-21 2.3 E/test2﹕ Done -2134183543
04-21 2.7 E/test3﹕ Done -2134183543

Start at EventBus.post and trace how ThreadMode.ASYNC dispatches the three tagged subscribers to its executor. Reproduce the issue with the three test1, test2, and test3 handlers; done means their work can overlap rather than always running sequentially, matching the concurrent timing shown in the report.