SteamOS 3.8.12 is now available for all users on Steam.

This update fixes Steam streaming in Desktop Mode for fullscreen games, a graphics driver issue causing the main menu in Sniper Elite 5 to not render correctly, and various SD card reader problems on some Legion Go S models.

SteamOS 3.8.12 has just been released for all users with the following changes:

General

• Fixed issue with Steam streaming in Desktop Mode in fullscreen games
• Fixed a graphics driver issue where the main menu in Sniper Elite 5 would not render correctly
• Fixed various issues with the SD Card reader on some Legion Go S models

Source: Steam