Different behaviour for onActivityResult in DialogFragment in Android O

I've noticed a difference between Android 7 (and before) and Android 8 (beta) when calling startActivityForResult from a DialogFragment.

In MainActivity below, when 'OK' is pressed on the dialog, it dismisses itself, creates and shows a new dialog, and calls startActivityForResult for AnotherActivity. AnotherActivity immediately finishes.

On Android 7, onActivityResult is called on the new dialog instance. On Android 8, onActivityResult is never called.

Can anyone explain this difference?

MCVE

public class MainActivity extends AppCompatActivity {

    private static final String FRAGMENT_TAG = "tag";

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        new SomeDialogFragment().show(getFragmentManager(), FRAGMENT_TAG);
    }

    public static class SomeDialogFragment extends DialogFragment
    {
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState)
        {
            super.onCreateDialog(savedInstanceState);

            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

            builder.setPositiveButton(
                    "OK",
                    new DialogInterface.OnClickListener()
                    {
                        @Override
                        public void onClick(DialogInterface d, int which)
                        {
                            dismiss();
                            SomeDialogFragment dialog = new SomeDialogFragment();
                            dialog.show(getFragmentManager(), FRAGMENT_TAG);
                            startActivityForResult(new Intent(getActivity(), AnotherActivity.class), 7);
                        }
                    });

            return builder.create();
        }

        @Override
        public void onActivityResult(int requestCode, int resultCode, Intent data)
        {
            // Called on Android 7 but not Android 8.
        }
    }
}

and

public class AnotherActivity extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setResult(1);
        finish();
    }
}