https://wccftech.com/microsoft-confirms-windows-10-version-2004-storage-spaces-issue/

Another day, another bug? Microsoft has now officially acknowledged the Storage Spaces bug that some users have been experiencing while updating to the latest Windows 10 version 2004, the May 2020 Update.

Microsoft said that devices using Parity Storage Spaces "might have issues using or accessing their Storage Spaces after updating to Windows 10, version 2004 (the May 2020 Update) and Windows Server, version 2004." The company added that "when using some configurations, partitions for Parity Storage Spaces might show as RAW in Disk Manager."