hey – pierre from sunrise here
i agree – we will continue to support Google Calendar
Reviews in the Play store indicate that I'm not the only one hitting this issue, but I couldn't find anything acknowledging the issue on the Sunrise support site.
Here are a couple of reviews that mention this issue:
https://play.google.com/store/apps/details?id=am.sunrise.and...
https://play.google.com/store/apps/details?id=am.sunrise.and...