Use User managed identity to replace connection string in"AzureWebJobsStorage" for function apps

Hi denniszheng - I've been trying to adopt this for deploying a hardened function app through bicep and AVM.  However, even though I no longer include a AzureWebJobsStorage appsetting in the deployment code, I still end up with one in the deployed resource.

Any ideas?

    appSettingsKeyValuePairs: {
      AzureWebJobsStorage__accountName: stMaintenance
      AzureWebJobsStorage__clientId: avmUserIdentity.outputs.clientId
      AzureWebJobsStorage__credential: 'managedidentity'
      FUNCTIONS_EXTENSION_VERSION: '~4'
      FUNCTIONS_WORKER_RUNTIME: 'powershell'
      managedIdentityId: avmUserIdentity.outputs.clientId
      WEBSITE_CONTENTAZUREFILECONNECTIONSTRING: '@Microsoft.KeyVault(VaultName=${kvMaintenance};SecretName=connectionString1)'
      WEBSITE_CONTENTSHARE: toLower(replace(funcMaintenance, '-', ''))
    }