Implicit Extensions don't generate "imports" as expected

[anthony-c-martin]

• main.bicep

  resource foo 'Microsoft.Graph/[email protected]' = {
    displayName: 'asdf'
    uniqueName: 'asdf'
  }

• bicepconfig.json

  {
      "experimentalFeaturesEnabled": {
          "extensibility": true
      },
      "extensions": {
          "microsoftGraphV1_0": "br:mcr.microsoft.com/bicep/extensions/microsoftgraph/v1.0:0.1.8-preview"
      },
      "implicitExtensions": [
          "microsoftGraphV1_0"
      ]
  }

The generated output includes the resource as if it were an ARM resource (without an import):

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "languageVersion": "2.1-experimental",
  "contentVersion": "1.0.0.0",
  "metadata": {
    "_EXPERIMENTAL_WARNING": "This template uses ARM features that are experimental. Experimental features should be enabled for testing purposes only, as there are no guarantees about the quality or stability of these features. Do not enable these settings for any production usage, or your production environment may be subject to breaking.",
    "_EXPERIMENTAL_FEATURES_ENABLED": [
      "Extensibility"
    ],
    "_generator": {
      "name": "bicep",
      "version": "0.30.23.60470",
      "templateHash": "6676791430580204440"
    }
  },
  "resources": {
    "foo": {
      "type": "Microsoft.Graph/[email protected]",
      "properties": {
        "displayName": "asdf",
        "uniqueName": "asdf"
      }
    }
  }
}