The following release notes coincide with Cumulative update for all the supported versions of Windows.
Windows 11
Windows 11 (original release): KB5009566 Build 22000.434
https://support.microsoft.com/topic/eee797fa-5ee3-4501-aeec-db3bc73b2c7b
Highlights
Updates a known issue that affects Japanese Input Method Editors (IME). Text you enter might appear out of order or the text cursor might move unexpectedly in apps that use the multibyte character set (MBCS).
Updates security for your Windows operating system.
Windows 10
Windows 10, version 20H2; Windows 10, version 21H1; and Windows 10, version 21H2 – KB5009543 Build 19042.1466; 19043.1466; and 19044.1066
https://support.microsoft.com/topic/b763552f-73bd-435a-b220-fc3e0bc9765b
UPDATED 01/11/22
REMINDER Windows 10, version 2004 reached end of servicing on December 14, 2021. To continue receiving security and quality updates, Microsoft recommends that you update to the latest version of Windows 10.
To update to one of the newer versions of Windows 10, we recommend that you use the appropriate Enablement Package KB (EKB). Using the EKB makes updating faster and easier and requires a single restart. To find the EKB for a specific OS, go to the Improvements and fixessection and click or tap the OS name to expand the collapsible section.
Highlights:
Updates a known issue that affects Japanese Input Method Editors (IME). Text you enter might appear out of order or the text cursor might move unexpectedly in apps that use the multibyte character set (MBCS).
Updates security for your Windows operating system.
Download the updates from the Microsoft Update Catalog.