Can't update StaticWebApp traffic splitting from AZ CLI

[ThibaultNocchi]

Describe the bug

I'm trying to update my traffic splitting distribution with az resource update, in vain.

Related command

az resource update -n XXX -g YYY --resource-type Microsoft.Web/staticSites --set 'properties.trafficSplitting={"environmentDistribution": {"env":100}}'

Errors

No error, only the JSON of the resource, without properties.trafficSplitting.environmentDistribution.

Issue script & Debug output

Nothing out of the ordinary.

Expected behavior

The traffic splitting of environments should be applied.

Environment Summary

az --version
azure-cli                         2.58.0

core                              2.58.0
telemetry                          1.1.0

Extensions:
account                            0.2.5

Dependencies:
msal                              1.26.0
azure-mgmt-resource             23.1.0b2

Python location '/opt/azure-cli/bin/python'
Extensions directory '/home/XXX/.azure/cliextensions'

Python (Linux) 3.11.8 (main, Feb 12 2024, 14:50:05) [GCC 13.2.1 20230801]

Legal docs and information: aka.ms/AzureCliLegal


Your CLI is up-to-date.

Additional context

I'm wondering if it's not due to this property not existing in the latest API version, even though the resource does have it when querying it from the portal or the CLI.

I also reported it in the SWA repo: Azure/static-web-apps#1432

[yonzhan]

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