Windows 10 build 20251

Windows 10 build 20251 is the twentieth Insider Preview build of Iron, the 21H1 development semester of Windows as a service. This build was released on 4 November 2020 to all Windows Insiders on the Dev Channel.

Bugs

 * Installing games downloaded from the Microsoft Store to a secondary drive that has no OS on it will result in the secondary drive becoming inaccessible. To prevent this bug from occurring, the default storage location for new content must be changed prior to installing the game. This can be done by navigating to Settings → Storage → Change where new content is saved.
 * The update process to this build has a chance of hanging for extended periods of time.
 * Live preview doesn't work for pinned site tabs on some machines, a gray window is seen instead of the intended content.
 * There's a chance of randomly encountering a  BSOD.
 * There's a chance of encountering an error with the error code 0x80070426 when using a Microsoft account to sign into certain apps. If this bug is encountered, it can be usually fixed by restarting the system.
 * The modern Disk Management page located at Settings → System → Storage → Manage Disks and Volumes in the Settings app is completely blank, and as a result it will not display any drives present on the system. To workaround this issue, use the legacy Disk Management tool to manage disk drives.
 * Some screens incorrectly have black text on dark backgrounds when using the dark theme.