Grails @DelegateAsync and dependency injection

I'm trying to use @DelegateAsync and running into some problems.

My setup looks pretty much like this:

@DelegateAsync(SynchronousService)
class AsyncService extends BaseService {}

class SynchronousService extends BaseService {}

abstract class BaseService {
  def grailsApplication
}

It seems that grailsApplication and other beans are never injected into SynchronousService. Should they be? AsyncService has everything wired up as I'd expect.