https://www.bleepingcomputer.com/news/microsoft/microsoft-releases-kb4580364-update-to-fix-windows-10-freezes/

​Microsoft has released the KB4580364 non-security update that fixes bugs causing responsiveness issues on affected Windows 10 2004 devices.

Windows 10 users who install the KB4580364 release preview update might experience issues with input, might not be able to enter text, or receive unexpected results if using the Microsoft Input Method Editor (IME) for Japanese or Chinese languages.