NetWorker: NMM Hyper-V parallel restore for multiple VMs fail for some VMs

If Hyper-V Virtual Machines are corrupted and the need for recovery of multiple virtual machines:
NMM enables recovery of multiple virtual machines to their original (source) locations. 

Prerequisites: 
● To recover virtual machines to the source Hyper-V server, ensure that the original drive letters or mount points for the virtual machines exist on the source server.
The directory paths are automatically created. Recovering virtual machines to the source server overwrites the source virtual machines.
● Because Hyper-V recognizes virtual machines by using an internal GUID, ensure that you do not either move or rename the virtual machines during the recovery operation.

The restore fails for some Virtual Machines when performing parallel restore for multiple Virtual Machines.

 nsrnmmrc: Restore failed with the error: Failed to complete BBB restore.
 

During the recovery process, NMM tries to stop and remove VM from Hyper-V manager using a PowerShell command.
 Get-VM -ComputerName '<hostname>' | Where-Object {$_.name -eq '<VMName>' } | Stop-VM -Force

This fails to stop and remove some of the VMs, which results in a failed restore.

Event logs > Hyper-v VMMS admin log show the following error:

Failed to perform the operation. The virtual machine is currently performing another operation
<VMName> failed to perform the 'Turning Off' operation. The virtual machine is currently performing the following operation: 'Shutting Down'.(Virtual machine ID GUID)

PowerShell's attempt to stop the VM fails with:

Get-VM -ComputerName '<hostname>' | Where-Object {$_.name -eq '<VMName>' } | Stop-VM -Force
Stop-VM : '<VMName>' failed to shut down. (Virtual machine ID <GUID>)
Failed to perform the operation. The virtual machine is currently performing another operation.
+ ... '<hostname>' | Where-Object {$_.name -eq <VMName> } | Stop-VM -Force
+                                                            ~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Stop-VM], VirtualizationException
    + FullyQualifiedErrorId : OperationFailed,Microsoft.HyperV.PowerShell.Commands.StopVM

PS C:\Using VHD> Get-VM -ComputerName '<hostname>' | Where-Object {$_.name -eq '<VMName>' } | Remove-VM -Force
Remove-VM : Deleting '<VMName>' failed.

Workaround:-
If encountering this issue, manually stop and remove the virtual machine and then perform a restore.
 
From Powershell
Step 1:- Turn off the virtual machine.
Get-VM -ComputerName '<hostname>' | Where-Object {$_.name -eq '<VMName>' } | Stop-VM -TurnOff

Note: Turns off the virtual machine <VMName>.
This operation is equivalent to disconnecting the power from the virtual machine, and can result in loss of unsaved data.

Step 2:- Remove the VM. 
Get-VM -ComputerName '<hostname>' | Where-Object {$_.name -eq '<VMName>' } | remove-VM

From Hyper-v Manager
Step 1:- Open the Hyper-V manager, Right click VMs and click "Turn Off".
                             
Step 2:- After "Turn off", right click the VM and click "Delete"