terraform-provider-azurerm: azurerm_virtual_machine_scale_set_extension not running

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Terraform (and AzureRM Provider) Version

Terraform v0.12.21

• provider.azurerm v1.44.0

Terraform Configuration Files

resource "azurerm_virtual_machine_scale_set_extension" "test" {
  name                         = "init-script"
  virtual_machine_scale_set_id = azurerm_windows_virtual_machine_scale_set.test.id
  publisher                    = "Microsoft.CPlat.Core"
  type                         = "RunCommandWindows"
  type_handler_version         = "1.1"
  auto_upgrade_minor_version   = true
  settings = jsonencode({
    script = split("\n", file("${path.module}/init.ps1"))
  })
  protected_settings = jsonencode({
    parameters = [
      {
        Name  = "input"
        Value = data.external.ip_address.result.privateIpAddress
      },
    ]
  })
}

Description / Feedback

I’m trying out the new azurerm_virtual_machine_scale_set_extension resource, and I may be missing something, but although the extensions are created they don’t seem to actually run. I’ve used the above example on the old VM scale set resource and it runs the script fine, but with the new resource nothing is run. Querying with the Azure CLI shows

{
  "autoUpgradeMinorVersion": true,
  "forceUpdateTag": null,
  "id": null,
  "name": "init-script",
  "protectedSettings": null,
  "provisionAfterExtensions": [],
  "provisioningState": null,
  "publisher": "Microsoft.CPlat.Core",
  "settings": {
    "script": [
      "param (",
      "  [string]$input",
      ")",
      "$ErrorActionPreference = \"Stop\"",
      "$ProgressPreference = \"SilentlyContinue\"",
      "Write-Host test"
    ]
  },
  "type": "RunCommandWindows",
  "typeHandlerVersion": "1.1"
}