CSI backup/restore to FS backup/restore fails

https://access.redhat.com/support/cases/#/case/03480591/

• Completed backup/restore with CSI snapshotting enabled
• Complete new FS backup of previously restored volumes from CSI snapshot
• Restore from FS backup 
• Restore fails as PVR never completes, and PVC remains pending with event:

failed to provision volume with StorageClass "gp2-csi": error getting handle for DataSource Type VolumeSnapshot by Name velero-mssql-pvc-v787x: error getting snapshot velero-mssql-pvc-v787x from api server: volumesnapshots.snapshot.storage.k8s.io "velero-mssql-pvc-v787x" not found

PVC dataSourceRef is reset here: https://github.com/vmware-tanzu/velero-plugin-for-csi/blob/main/internal/restore/pvc_action.go#L71-L81 which causes the error.