Exploring the WebCache file on a Windows 10 computer, The Verge was able to partially confirm Singh’s results, recovering evidence of a site visited in private mode after the session had been closed. We were not able to locate the Container_n table or recover a complete web history from the Private Session, although it’s likely a trained professional would have more success.Microsoft confirmed the issue and explained they're committed to resolving it as quickly as possible.
Source: The Verge