Passing untyped objects to parameters with custom types no longer works in 0.25.3

[mattias-fjellstrom]

Bicep version
Bicep CLI version 0.25.3 (8627085)

Describe the bug
After upgrading to 0.25.3 we discovered that passing in an untyped object to a parameter with a custom type no longer works, even if the untyped object has the required fields. Bicep produces an error directly in the editor if you try this.

To Reproduce
The following sample code mimics a setup we have been using successfully up until and including 0.24.24.

Create main.bicep:

module data 'data.bicep' = {
  name: 'data-module'
}

module app 'app.bicep' = {
  name: 'app-module'
  params: {
    identity: data.outputs.identity
  }
}

Create data.bicep:

resource identity 'Microsoft.ManagedIdentity/userAssignedIdentities@2023-01-31' existing = {
  name: 'my-identity'
}

output identity object = union(identity, { name: identity.name, id: identity.id })

Create app.bicep:

param identity {
  id: string
}

output id string = identity.id

In main.bicep you now have an error The specified "object" declaration is missing the following required properties: "id".bicep(BCP035):

The output from data.bicep is an untyped object with the following shape:

{
  "outputs": {
    "identity": {
      "type": "Object",
      "value": {
        "apiVersion": "2023-01-31",
        "condition": true,
        "existing": false,
        "id": "/subscriptions/<redacted>/resourceGroups/rg-identity/providers/Microsoft.ManagedIdentity/userAssignedIdentities/my-identity",
        "isAction": false,
        "isConditionTrue": true,
        "isExtensibleResourceReference": false,
        "isTemplateResource": false,
        "location": "swedencentral",
        "name": "my-identity",
        "properties": {
          "clientId": "<redacted>",
          "principalId": "<redacted>",
          "tenantId": "<redacted>"
        },
        "provisioningOperation": "Read",
        "referenceApiVersion": "2023-01-31",
        "resourceGroup": "rg-identity",
        "resourceGroupName": "rg-identity",
        "resourceId": "Microsoft.ManagedIdentity/userAssignedIdentities/my-identity",
        "scope": "",
        "subscriptionId": "<redacted>",
        "tags": {}
      }
    }
  }
}

Was this intentionally broken? Perhaps it was a bug that this was allowed, and now the bug is fixed? :)

Additional context
We are using this pattern a lot where we have "data modules" that expose various resources in similar ways. We use union(<resource>, { name: <resource>.name, id: <resource>.id }) since in general the id and name properties are not included otherwise.

[slavizh]

+1

[cedricbraekevelt]

I have already reported this over here #13247

[mattias-fjellstrom]

Fixed by #13272, thanks @cedricbraekevelt