[aks-preview@20.0.0b8] az aks update: "ValueError: too many values to unpack (expected 3)"

[wleong-harmonicinc]

Describe the bug

az aks update <anything> will result error with aks-preview@20.0.0b8

Related command

Run az aks update --name "my-cluster-1" --resource-group "my-rg-1" --tags test_label=2
or run az aks update <anyting>

Errors

The behavior of this command has been altered by the following extension: aks-preview
The command failed with an unexpected error. Here is the traceback:
too many values to unpack (expected 3)
Traceback (most recent call last):
  File "/lib64/az/lib/python3.12/site-packages/knack/cli.py", line 233, in invoke
    cmd_result = self.invocation.execute(args)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib64/az/lib/python3.12/site-packages/azure/cli/core/commands/__init__.py", line 666, in execute
    raise ex
  File "/lib64/az/lib/python3.12/site-packages/azure/cli/core/commands/__init__.py", line 734, in _run_jobs_serially
    results.append(self._run_job(expanded_arg, cmd_copy))
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib64/az/lib/python3.12/site-packages/azure/cli/core/commands/__init__.py", line 703, in _run_job
    result = cmd_copy(params)
             ^^^^^^^^^^^^^^^^
  File "/lib64/az/lib/python3.12/site-packages/azure/cli/core/commands/__init__.py", line 336, in __call__
    return self.handler(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib64/az/lib/python3.12/site-packages/azure/cli/core/commands/command_operation.py", line 120, in handler
    return op(**command_args)
           ^^^^^^^^^^^^^^^^^^
  File "/home/user/.azure/cliextensions/aks-preview/azext_aks_preview/custom.py", line 1459, in aks_update
    mc = aks_update_decorator.update_mc_profile_preview()
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.azure/cliextensions/aks-preview/azext_aks_preview/managed_cluster_decorator.py", line 8099, in update_mc_profile_preview
    mc = self.update_mc_profile_default()
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib64/az/lib/python3.12/site-packages/azure/cli/command_modules/acs/managed_cluster_decorator.py", line 9501, in update_mc_profile_default
    mc = self.update_network_profile_advanced_networking(mc)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib64/az/lib/python3.12/site-packages/azure/cli/command_modules/acs/managed_cluster_decorator.py", line 8210, in update_network_profile_advanced_networking
    (acns_enabled, acns_observability, acns_security) = self.context.get_acns_enablement()
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: too many values to unpack (expected 3)

Issue script & Debug output

N/A

Expected behavior

No error

Environment Summary

> az -v
azure-cli                         2.81.0 *

core                              2.81.0 *
telemetry                          1.1.0

Extensions:
aks-preview                     20.0.0b8

Dependencies:
msal                            1.34.0b1
azure-mgmt-resource               23.3.0

Additional context

No response

[yonzhan]

Thank you for opening this issue, we will look into it.