Windows 10 build 20257

Windows 10 build 20251 is the twentieth Insider Preview of Iron. It was released on 4 November 2020 to all Windows Insiders on the Dev Channel.

Bugs

 * Live preview doesn't work for pinned site tabs on some machines.
 * Installing games from the Store to a secondary non-OS drive will result in the secondary drive becoming inaccessible. To prevent this from occurring, you must change the default drive where new content is saved through Settings → System → Storage → Change where new content is saved.
 * There's a chance of randomly encountering a  BSOD.
 * Some users are seeing error 0x80070426 when using their Microsoft account to sign into various apps. Restarting usually fixes this.
 * The modern Disk Management page (Settings → System → Storage → Manage Disks and Volumes) in the Settings app is blank, as a result, it won't display any drives present. To workaround this issue, use the classic Disk Management tool to manage disk drives.
 * Some screens incorrectly have black text on dark backgrounds when the dark theme is used.

Source

 * Official announcement