Microsoft has now notified customers over Twitter that the Windows 10 1903 open issues list has been updated to acknowledge the problem introduced for the Start Menu and Search.
📣 [Windows Release Health Update – New Known Issue: Acknowledged] Some users report issues related to the Start menu and Windows Desktop Search. Read more here: https://t.co/NHEQuEjsVX.
— Windows Update (@WindowsUpdate) September 12, 2019
For the 1903 list of open issues, most have been mitigated or resolved, but some remain open as the company works to fix them all.