In the Notes app, all notes saved to an iCloud account were missing post-install without any means of recovering or a reasonable means of migrating notes to an alternate app.
In the Calendar app, any events stored in an iCloud calendars disappeared from the app post-install.
Notes:
In the Notes app, all notes saved to an iCloud account were missing post-install without any means of recovering or a reasonable means of migrating notes to an alternate app.
In the Calendar app, any events stored in an iCloud calendars disappeared from the app post-install.