Windows 10 Build 18317 is rolling out to the Insiders enrolled in the Fast Ring with improvements, fixes, and its own set of known issues. Microsoft warns that the update may contain unexpected bugs that might be painful for some users. The latest update to Windows 10 19H1 is decoupling Search and Cortana in the taskbar. Microsoft says that the Cortana and Search separation was being A/B tested with some Insiders and with this update, the company is pushing the changes to more devices.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-insider-build-18317-released-and-breaks-wsl-again/