AsyncTask in BlockingObservable returns nothing

I want to get a list of artists from audio recordings VC. instead of responsa silence, "INONCOMPLETE" is not displayed. Moreover, if instead of toBlocking I use onSubscribe, or I throw Observable without Blocking in zip, everything works

bands = Observable.create(new Observable.OnSubscribe<VKResponse>() { @Override public void call(final Subscriber<? super VKResponse> subscriber) { VKApi.audio().get().executeWithListener(new VKRequest.VKRequestListener() { @Override public void onComplete(VKResponse response) { super.onComplete(response); System.out.println("INONCOMPLETE "); subscriber.onNext(response); subscriber.onCompleted(); } @Override public void attemptFailed(VKRequest request, int attemptNumber, int totalAttempts) { super.attemptFailed(request, attemptNumber, totalAttempts); System.out.println("attemptFailed"); subscriber.onError(new Exception("attemptFailed")); } @Override public void onError(VKError error) { super.onError(error); System.out.println(error.toString()); subscriber.onError(new Exception(error.toString())); } @Override public void onProgress(VKRequest.VKProgressType progressType, long bytesLoaded, long bytesTotal) { super.onProgress(progressType, bytesLoaded, bytesTotal); } }); } }) .flatMap(vkResponse -> Observable.from((VKList<VKApiAudio>) vkResponse.parsedModel)) .flatMap(vkApiAudio -> Observable.just(vkApiAudio.artist)) .distinct() .toList() .toBlocking() .single();