https://wccftech.com/windows-10-insider-preview-build-19559-1000-fast-ring-insiders/

Microsoft has released a new Windows 10 Insider Build 19559 to those in the Fast ring. Today's build follows the release of Preview Build 19555 last week.

Build 19559.1000 doesn't bring any new changes and focuses on general improvements and fixes. There is also quite a long list of known issues that the company has to address. But considering this is quite early in the development stage, problems and breaking bugs are expected and even welcomed by Insiders. Here is the complete changelog: