Xamarin Forms DisplayAlert option text not displayed.

We are using Display Alter for confirmation prompt which is working fine with the messages display. But text for confirmation event like 'Yes' or 'No' is not displaying, but click event is happening by click the position of the options.

Screen shot for reference.

Example Code:

        var result = await DisplayAlert("Confirm", "Are you sure to update delivery date?", "OK", "Later");
        if (result)
        {
     }

Any help or suggestions would be thankful.!