Installing latest aks-preview fails because of a failing checksum #10101

Describe the bug

Installing latest aks-preview fails because of a failing checksum.

Related command

az extension add --name aks-preview --upgrade

Errors

No stable version of 'aks-preview' to install. Preview versions allowed.
Extension 'aks-preview' 21.0.0b7 is already installed.
It will be overridden with version 21.0.0b9.
An error occurred whilst updating.
The checksum of the extension does not match the expected value. Use --debug for more information.
Failed to update. Rolled aks-preview back to 21.0.0b7.

Issue script & Debug output

cli.azure.cli.core.extension.operations: Backing up the current extension: /home/bert-blommers/.azure/cliextensions/aks-preview to /tmp/tmpnvs7j82f/aks-preview
cli.azure.cli.core.extension.operations: Extension source is url? True
cli.azure.cli.core.extension.operations: Downloading https://azcliprod.blob.core.windows.net/cli-extensions/aks_preview-21.0.0b9-py2.py3-none-any.whl to /tmp/tmpv3e1rhk5/aks_preview-21.0.0b9-py2.py3-none-any.whl
urllib3.connectionpool: Starting new HTTPS connection (1): azcliprod.blob.core.windows.net:443
urllib3.connectionpool: https://azcliprod.blob.core.windows.net:443 "GET /cli-extensions/aks_preview-21.0.0b9-py2.py3-none-any.whl HTTP/1.1" 200 841813
cli.azure.cli.core.extension.operations: Downloaded to /tmp/tmpv3e1rhk5/aks_preview-21.0.0b9-py2.py3-none-any.whl
cli.azure.cli.core.extension.operations: Validating the extension /tmp/tmpv3e1rhk5/aks_preview-21.0.0b9-py2.py3-none-any.whl
cli.azure.cli.core.extension.operations: Invalid checksum for /tmp/tmpv3e1rhk5/aks_preview-21.0.0b9-py2.py3-none-any.whl. Expected 'ff4b0191c48984656b48319b06c493952f021725c27bb6209ca28b17f0225427', computed 'ae64156264aefec1c46c6dcb56f2f6f01cde3e03188fcc5bdc37fd177def1854'.
cli.azure.cli.core.extension.operations: An error occurred whilst updating.
cli.azure.cli.core.extension.operations: The checksum of the extension does not match the expected value. Use --debug for more information.
cli.azure.cli.core.extension.operations: Copying /tmp/tmpnvs7j82f/aks-preview to /home/bert-blommers/.azure/cliextensions/aks-preview
cli.azure.cli.core.azclierror: Traceback (most recent call last):
File "/opt/az/lib/python3.14/site-packages/azure/cli/core/extension/operations.py", line 429, in update_extension
_add_whl_ext(cli_ctx=cmd_cli_ctx, source=download_url, ext_sha256=ext_sha256,
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pip_extra_index_urls=pip_extra_index_urls, pip_proxy=pip_proxy)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.14/site-packages/azure/cli/core/extension/operations.py", line 143, in _add_whl_ext
raise CLIError("The checksum of the extension does not match the expected value. "
"Use --debug for more information.")
knack.util.CLIError: The checksum of the extension does not match the expected value. Use --debug for more information.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/opt/az/lib/python3.14/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
File "/opt/az/lib/python3.14/site-packages/azure/cli/core/commands/init.py", line 677, in execute
raise ex
File "/opt/az/lib/python3.14/site-packages/azure/cli/core/commands/init.py", line 820, in _run_jobs_serially
results.append(self._run_job(expanded_arg, cmd_copy))
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.14/site-packages/azure/cli/core/commands/init.py", line 789, in _run_job
result = cmd_copy(params)
File "/opt/az/lib/python3.14/site-packages/azure/cli/core/commands/init.py", line 335, in call
return self.handler(*args, **kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.14/site-packages/azure/cli/core/commands/command_operation.py", line 120, in handler
return op(**command_args)
File "/opt/az/lib/python3.14/site-packages/azure/cli/command_modules/extension/custom.py", line 16, in add_extension_cmd
return add_extension(cli_ctx=cmd.cli_ctx, source=source, extension_name=extension_name, index_url=index_url,
yes=yes, pip_extra_index_urls=pip_extra_index_urls, pip_proxy=pip_proxy, system=system,
version=version, upgrade=upgrade, allow_preview=allow_preview)
File "/opt/az/lib/python3.14/site-packages/azure/cli/core/extension/operations.py", line 341, in add_extension
update_extension(cmd=cmd, extension_name=extension_name, index_url=index_url, pip_extra_index_urls=pip_extra_index_urls, pip_proxy=pip_proxy, cli_ctx=cli_ctx, version=ext_version, download_url=source, ext_sha256=ext_sha256)
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.14/site-packages/azure/cli/core/extension/operations.py", line 438, in update_extension
raise CLIError('Failed to update. Rolled {} back to {}.'.format(extension_name, cur_version))
knack.util.CLIError: Failed to update. Rolled aks-preview back to 21.0.0b7.

Expected behavior

To not fail

Environment Summary

azure-cli 2.88.0

core 2.88.0
telemetry 1.1.0

Extensions:
aks-preview 21.0.0b7
application-insights 1.2.3

Dependencies:
msal 1.36.0
azure-mgmt-resource 24.0.0

Python location '/opt/az/bin/python3'
Config directory '/home/name/.azure'
Extensions directory '/home/name/.azure/cliextensions'

Python (Linux) 3.14.5 (main, Jun 30 2026, 10:52:58) [GCC 13.3.0]

Additional context

Previous occurances:

#2302
#2313