Microsoft has released Windows 10 Insider Preview Build 18361 (19H1) to Insiders in the Fast ring. As we get closer to its final release in April, these builds will mostly be bug fixes. Unfortunately, this build still contains some problematic bugs that I would be surprised Microsoft would allow into the final release. There are also bugs with Createive X-Fi and Realtek SD card readers still remaining in this build that should be fixed before release. To see the entire release notes, you can read the blog post.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-insider-preview-build-18361-19h1-still-has-some-bugs-to-fix/