Since iOS 13 - A lot of app deletions in App Store Connect, can anybody check if this happens with your App as well

Low-memory phones are prompted to delete all apps before the upgrade.

One of my colleagues has a 6S that is chock-full of photos. When she upgraded she was told that all of her apps would stored in the cloud but deleted on the phone, to make room. After the upgrade, she still had all the app icons, but those were really just shortcuts to re-download each app anew.

Apparently this also kills notifications, because without the app on the device there's nothing to execute the notification.