Windows 10 build 20257

Windows 10 build 20257 is the twenty-first Insider Preview build of Iron. This build was released on 11 November 2020 to all Windows Insiders on the Dev Channel.

Changes

 * The Start menu tile theming logic has been updated so that the tile background for Win32 apps will no longer be adjusted based on the detected contrast ratio. However, Microsoft Edge PWAs (Progressive Web Apps) are excluded from this change.

Bugs

 * At the time of release, the update process had a chance of hanging for extended periods of time when attempting to install this build.
 * 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 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.