https://www.bleepingcomputer.com/news/microsoft/windows-10-updates-health-report-kb4566782-and-kb4565351/

This Windows 10 Health Report provides an overview of the problems people encounter with the recently released Windows 10 2004 KB4566782 and Windows 10 1909 KB4565351 cumulative updates.

Microsoft releases new Windows updates on the second Tuesday of every month, known as Patch Tuesday, to fix operating system bugs and security vulnerabilities.