Volume Snapshot Fails After First Successful Snapshot – (XCP-ng 8.3, CloudStack 4.21)

### problem

We are encountering an issue while creating volume snapshots on VMs hosted on XCP-ng 8.3 with FC primary storage.
The first snapshot is created successfully, however any subsequent snapshot attempt fails.

Error
The snapshot job fails with the following error:
failed to getVhdParent with args isISCSI

### versions

Component Version
CloudStack 4.21
Hypervisor XCP-ng 8.3
Storage Type Pre-setup Storage over FC
Primary Storage Fibre Channel (FC)

### The steps to reproduce the bug

snapshot of the volume → Success.
Attempt to create the second snapshot of the same volume → Failure.

Logs:
[logs.txt](https://github.com/user-attachments/files/25788703/logs.txt)

### What to do about it?

_No response_

Comece lendo o logs.txt anexado e reproduza a sequência: crie um snapshot de volume e, em seguida, tente criar um segundo no mesmo volume na configuração XCP-ng e FC listada. Rastreie o erro reportado “getVhdParent with args isISCSI” no caminho do snapshot. Está concluído quando snapshots consecutivos forem bem-sucedidos sem esse erro.

Escrita pelo modelo de indexação a partir do texto da issue.