Though the problem may have affected a relatively low number of users, the result was a gut punch to Microsoft's current update process. If, for example, you moved the Documents folder from its location in the user profile to a new location, such as a secondary data drive, but some files remained in the old location, the setup logic for the version 1809 upgrade removed the folder in the old location as well as all of the files in it. "This occurred if Known Folder Redirection (KFR) had been previously enabled, but files remain in the original "old" folder location vs being moved to the new, redirected location". Back when it released the April 2018 update, Microsoft found that users with KFR enabled experienced empty copies of their Known Folders on the devices.
"Prior to re-releasing the October 2018 Update our engineering investigation determined that a very small number of users lost files during the October 2018 Update", stated the Microsoft announcement.
You can install the relevant Windows 10 cumulative update on your machines through Settings Update and Security Windows Update Check for updates.
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Microsoft added code in the October 2018 update that would make sure these empty duplicate folders were removed.
According to Microsoft, only one one-hundredth of a single percent of people who manually updated to version 1809 experienced data loss.
Microsoft is working to re-release the October 2018 Update publicly, but it is first testing a new build that it says fixes the file deletion issue.
Microsoft may be in a pickle right now due to the hiccupy rollout of its latest Windows 10 October 2018 Update, but that's not stopping the company from supporting the previous versions of Windows 10.