https://wccftech.com/microsoft-releases-windows-10-update-for-v21h1-20h2-2004/

Microsoft has released this month's non-security updates, referred to as the "C" release. The updates are available for the latest Windows 10 May 2021 Update, version 21H1, along with versions 20H2 and 2004. This update was released to the Release Preview Channel Insiders last week. Some of the highlights of today's fixes include:

Windows 10 version 21H1, version 20H2, and version 2004 all share the same core operating system, which means they all receive the same set of updates. Following are changes and improvements coming with today's Windows 10 update KB5004296: