Quote:Microsoft has corrected issues that caused data loss on systems upgraded to the company's new feature update the October 2018 Update.
The company released the update on October 2, 2018 as a manual update to give interested users and administrators an option to install the update right away.

Reports emerged shortly after the release that data loss occurred on some upgraded systems after the upgrade to Windows 10 version 1809.
Microsoft stopped the update to investigate the issue and found the issue according to John Cable, Director of Program Management, Windows Servicing and Delivery.

An updated version of the Windows 10 October 2018 Update is distributed to Insider Channels. Microsoft will monitor feedback closely and will push the update to retail update channels afterward but a release date has not been revealed yet.

Full reading: https://www.ghacks.net/2018/10/10/microsoft-fixed-the-data-loss-issue-in-windows-10-version-1809/