az kusto cluster update with --sku specified updates unrelated properties

[mkeesey]

Describe the bug

When running az kusto cluster update --name <name> --subscription <sub> --resource-group <group> --sku name="<sku>" tier="Standard" to migrate compute skus, several unrelated properties of the cluster also were updated.

1. enableAutoStop switched from false to true
2. enableDiskEncryption switched from true to false
3. enablePurge switched from true to false

This is quite unexpected since these properties were not specified, and I do not see anything in the command docs that they are required or have default values.

Related command

az kusto cluster update

Errors

n/a

Issue script & Debug output

n/a - appears to reproduce with any invocation that involves a sku migration.

Expected behavior

I expect the SKU to be updated, but those unconfigured properties to retain their original values.

Environment Summary

azure-cli 2.87.0 *

core 2.87.0 *
telemetry 1.1.0

Extensions:
acr-transfer Unknown
acrtransfer 1.1.0
aks-preview 18.0.0b43
azure-devops 1.0.2
azure-firewall 1.2.2
kusto 0.5.0
nsp 1.0.0
resource-graph 2.1.0
support 2.0.1

Dependencies:
msal 1.36.0
azure-mgmt-resource 24.0.0

Python location '/bin/python3.12'
Config directory '/home//.azure'
Extensions directory '/home//.azure/cliextensions'
Extensions system directory '/usr/lib/python3.12/site-packages/azure-cli-extensions'

Python (Linux) 3.12.9 (main, Jun 2 2026, 15:06:48) [GCC 13.2.0]

Legal docs and information: aka.ms/AzureCliLegal

Additional context

No response

[azure-client-tools-bot-prd]

Hi @mkeesey,

2.87.0 is not the latest Azure CLI(2.88.0).

If you haven't already attempted to do so, please upgrade to the latest Azure CLI version by following https://learn.microsoft.com/en-us/cli/azure/update-azure-cli.

[mkeesey]

Given this would be within the kusto extension, I don't think a minor version bump with the base cli would fix this.