we did a test restore of a windows 10 vm, which is hosted on a server 2019 Hyper-V. The first tests resulted "successful", but with only 372 bytes. No vhdx and other files were restored. No errors inside the log.
I then restarted BE explicitly as administrator and the restore worked.
All other restores were good, except this vm. The restores of virtual servers hosted on another server 2008R2 Hyper-V had not that issue. Just the restore of the windows 10 vm on the server 2019 must be restored in BE admin-contect.