NSPersistentCloudKitContainer and App Extensions

Can the behavior of NSPersistentCloudKitContainer be described in App Extensions? I have seen Forum entries that describe its behavior in Widgets - it will save data locally, but will not sync that data until the app is opened.

This is a pretty major downsides for any apps that use SiriKit Extensions to allow for quick, simple data entry -- not syncing the data until the app is opened (which could be days later) would be a deal breaker.

I hope this can be clearly described, and improved (if my understanding is correct) - I've filed a feedback to document this as well: FB9170155