The subject says it all and I consider It a bug because this seems like a lack of implementation of the standard iOS feature. There is no control over it so I am forced to receive notifications on the watch even though they should be delivered at a certain time of the day. Since the purpose of the notification summary is to group less important notifications, the issue is really frustrating and makes the whole iOS function useless. I could either stop using the feature on the phone or disable notifications on the watch completely, which both are far from being a proper solution.