neowin[.]net/news/microsoft-releases-windows-10-build-19041508-183631082---heres-whats-new
neowin[.]net/news/recent-windows-10-version-2004-patch-tuesday-updates-are-reportedly-breaking-wsl-2
The Win10 update seems to have fixed all the problems installing the so-called preview cumulative update from a week or so ago, and includes the fix for Win10 wanting to defrag SSDs every day. However, it may break WSL2 -- the 2nd version of Linux in Windows.
neowin[.]net/news/heres-whats-new-for-windows-81-and-7-this-patch-tuesday
Officially, everything's cool with this update. Unofficially, those using a hack to continue getting Win7 updates may find that they have to update their hack.