https://wccftech.com/windows-10-version-2004-cumulative-update-kb4557957-19041-329/

Microsoft has released its first batch of cumulative updates for the latest Windows 10 May 2020 Update, which was delivered at the end of last month. KB4557957 (Build 19041.329) brings a number of security fixes and improvements. However, most of the known issues are yet to be addressed.

From the list of known issues of Windows 10 version 2004, only the restart bug appears to have been mitigated through today's cumulative update. The issue, as reported earlier, was with some devices using Always On, Always Connected feature.