Known Issue Rollback (KIR) is a Windows 10 capability used to revert buggy non-security fixes delivered through Windows Update and has been in use since 2019. Learn more about KIR in the Bleeping Computer article at Microsoft: Windows 10 'Known Issue Rollback' auto-fixes update bugs (https://www.bleepingcomputer.com/news/microsoft/microsoft-windows-10-known-issue-rollback-auto-fixes-update-bugs/?fbclid=IwAR2COP9osJPsRDg0pffdu6zD57xHEw20Y71cJixa-pGh0DYumO8ovbxyBXg).