"items" is incorrectly flagged in full template validation mode

[StephenWeatherford]

From Azure/bicep#11954

THe following:

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "metadata": {
    "_generator": {
      "name": "bicep",
      "version": "0.21.1.54444",
      "templateHash": "2945005248419935276"
    }
  },
  "parameters": {
    "nsgValues": {
      "type": "object",
      "defaultValue": {
        "nsg1": {
          "name": "nsg-westus1",
          "location": "westus"
        },
        "nsg2": {
          "name": "nsg-east1",
          "location": "eastus"
        }
      }
    }
  },
  "resources": [
    {
      "properties": {},
      "copy": {
        "name": "nsg",
        "count": "[length(items(parameters('nsgValues')))]"
      },
      "type": "Microsoft.Network/networkSecurityGroups",
      "apiVersion": "2020-06-01",
      "name": "[items(parameters('nsgValues'))[copyIndex()].value.name]",
      "location": "[items(parameters('nsgValues'))[copyIndex()].value.location]"
    }
  ]
}

gives this error:

Template validation failed: The template resource '[items(parameters('nsgValues'))[copyIndex()].value.name]' at line '27' and column '5' is not valid: The template function 'items' is not valid. Please see https://aka.ms/arm-template-expressions for usage details.. Please see https://aka.ms/arm-template-expressions for usage details.

EXPECTED: no error

[StephenWeatherford]

@dxk3355 Unfortunately, this false error is coming from our backend validation code from Azure which is out of date and no longer updated. We don't currently have the resources to fix this properly, as our focus is on Bicep. I apologize for the inconvenience.