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ReFS volume appears RAW (version doesn't match expected value) after Windows Update
After Windows Update last night, Windows Server 2019 wouldn't mount a storage space volume as ReFS (it appears as RAW). The error in the ReFS event log is "ReFS failed to mount the volume. Version 1....
I solved this by uninstalling KB5009557. The ReFS volume came back working as it should, instead of appearing as RAW.
Update: since even the February 2022 Windows Update bricks ReFS in the same way, and hints from Microsoft are that ReFS 1.x is no longer supported, we copied everything to new disks, upgrading ReFS from 1.2 to 3.4 in the process. Such a (manual) ReFS upgrade should be the solution that everyone needs, allowing to re-enable Windows Update.
A day after the other out-of-band updates, KB5010791 was made available for Windows Server 2019 as well. However, it did not resolve the ReFS issue for me. I uninstalled KB5010791 and then KB5009557, and the broken ReFS volume mounted fine again (it is on a storage space, not removable media).
https://support.microsoft.com/en-us/topic/january-18-2022-kb5010791-os-build-17763-2458-out-of-band-43697313-d8e0-4918-b6df-7f64d4d9a8cd
