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android - addOnCompleteListener not called offline with cloud firestore

I have been writing an app using the new cloud firestore database. It works great except the fact that many things are not working smoothly when offline although the offline persistence is enabled. For instance I do the following:

ref.delete().addOnCompleteListener(new OnCompleteListener<Void>() {
            @Override
            public void onComplete(@NonNull Task<Void> task) {
                if (task.isSuccessful()) {
                    //Do something
                } else {
                    //Do another thing
                }

            }
        });

However the onComplete method is never called when offline. I want to close the activity and show some Snachbar once this happens. But as it never does, the activity remains open. I am using android studio emulator.

Thanks

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