In the meantime, for anyone who has installed this update, Microsoft has provided the following instructions to make your drives read-only, to avoid data corruption because of the Storage Spaces issue:
1. Select Start and type: PowerShell
2. Right click or long press on Windows PowerShell and select Run as administrator.
3. If prompted by a User Access Control dialog for Windows Powershell, select yes.
4. Within the PowerShell dialog, type the following command and press enter: get-virtualdisk | ? WriteCacheSize -gt 0 | get-disk | set-disk -IsReadOnly $true
5. Your Storage Spaces should now be set to read only, meaning you will not be able to write to them. Your device will still be usable, and any volume not seen as RAW should be readable.
This will only be necessary if you are already on Windows 10 build 2004, and you use the Storage Spaces feature.
For the Defrag Tool Microsoft simply recommends not using the Defrag Tool until this issue has been resolved in a future update.