OS diskSizeGB is not showing when VM deallocated state running from api

Question

API to list the VM info, and we found that if the VM is in deallocated status, the os_disk_size_gb is empty, we just want to confirm if this is by design ? If not please share that where is blocking?

Also confirm me if we have any pubic document availableif its by design ?

API running Compute managemen

Disks - Get - REST API (Azure Compute) | Microsoft Learn [learn.microsoft.com]

VM running
"deleteOption": "Delete",
            "diskSizeGB": 30
===============================
VM deallocated

},             "deleteOption": "Delete"           },

VM running state : 

"osType": "Linux",
            "name": "ubuntu22.04_OsDisk_1_4XXXXXXXXX",
            "createOption": "FromImage",
            "caching": "ReadWrite",
            "managedDisk": {
              "storageAccountType": "Standard_LRS",
              "id": "/subscriptions/3XXXXXXXXXXX/resourceGroups/CENTRALINDIA/providers/Microsoft.Compute/disks/ubuntu22.04_OsDisk_1_4XXXXXXXXXXXXXXXX"
            },
            "deleteOption": "Delete",
            "diskSizeGB": 30

VM deallocated state:

"osDisk": {
            "osType": "Linux",
            "name": "ubuntu18.04_OsDisk_1_f1XXXXXXXXXXX",
            "createOption": "FromImage",
            "caching": "ReadWrite",
            "managedDisk": {
              "id": "/subscriptions/3XXXXXXXXX/resourceGroups/CENTRALINDIA/providers/Microsoft.Compute/disks/ubuntu18.04_OsDisk_1_fXXXXXXXXXXXXXX"
            },
            "deleteOption": "Delete"
          },

Answer 1

@suresh Reddy

This seems to be an expected one i.e. by design w.r.t API , I was also able to repro the same:

One of the git hub issue discussion was revealing the same fact:

https://github.com/Azure/azure-libraries-for-net/issues/54

One of the discussion snippet: (See the reason highlighted)

Regards,

Shiva.