Microsoft has released Windows 10 Insider Preview Build 18346 (19H1) to Insiders in the Fast ring. This release is a maintenance build only that resolves numerous bugs, but does not add any new features. No new features have been added, but bugs in Bluetooth and PowerShell have been fixed. Crashes in Start Menu and Settings have also been fixed in this build. To see the entire release notes, you can read the blog post to see the full release notes below. If you are a Windows Insider in Fast ring you can update to the latest build by checking for new updates.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-insider-preview-build-18346-released-with-bug-fixes/