Microsoft has published an article for devices that have already updated to Windows 10, version 2004 or Windows Server, version 2004 and are affected by the issue using Parity Storage Spaces.

Workarounds for Windows 10 2004's Storage Spaces issue published by Microsoft

If you have already updated to Windows 10, version 2004 and are affected by this issue:

We recommend you check that the troubleshooter has run or apply the steps below and wait for a full mitigation or an update to address this issue. Attempts to mitigate the issue using methods not mentioned in this article might result in damaging of files, especially if the volume shows as RAW in Disk Manager.
Reverting to previous versions of Windows does not resolve this issue on affected devices.
We do not recommend running the chkdsk command on any device affected by this issue.

Workaround and recovery steps for issue with some Parity Storage Spaces