Hi @Pilow,
Thanks for the report.
We are aware that there are many problems with the FLR. We would like to fix them but they are not easy to fix, and we can't give an estimation date for a fix. I've linked this topic to our investigation ticket.
For the moment, when FLR fails, we recommend to manually restore your files by following this documentation: https://github.com/vatesfr/xen-orchestra/blob/master/%40vates/fuse-vhd/README.md#restore-a-file-from-a-vhd-using-fuse-vhd-cli