We have seen a few customer reports of errors running a peer storage solution called Nomad.
Migration Manager writes to Windows. It appears the Nomad software intercepts those writes and copies them to a cache. It then reports a successful write operation. Unfortunately, it has not yet fully written the file to storage. Migration Manager continues to operate on this basis. The Nomad software seems to lose track of the files and they are not successfully written or recorded.
The best solution is to disable Nomad during migration. We will reach out to the company and alert them of the error and see if we can work together to address.