Windows 10 build 19640

Windows 10 build 19640 is the twenty-first Insider Preview build of Manganese, the 20H2 development semester of Windows as a service. This build was released to Windows Insiders in the Fast Ring on 3 June 2020.

Changes

 * If the users's download folder is synced to a cloud provider, it disables the option to have Storage Sense automatically clear your Downloads folder on a cycle.
 * Login logic was updated, so if the user has their PC set up so they have to type their username while logging in, typing a space at the beginning of your username will not generate an error anymore.

Bugs and quirks

 * Some devices have a chance of crashing with a BSOD upon resuming from hibernate if booting from eMMC storage.
 * The update process to this build has a chance of hanging for extended periods of time.
 * Both the documents and downloads sections in the privacy settings have broken icons, and as such, rectangles show up where the icons are intended to be instead.
 * Taskbar preview thumbnails sometimes do not render consistently. If this happens, a blank area will be shown instead of the thumbnail.