Parameter references should work across the main template and the linked template (and nested templates)

[StephenWeatherford]

1229.json

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "parameter1": { // top-level parameter1 definition in main template
            "type": "string",
            "metadata": {
                "description": "description"
            }
        }
    },
    "resources": [
        {
            "name": "linkedDeployment1",
            "type": "Microsoft.Resources/deployments",
            "apiVersion": "2020-10-01",
            "properties": {
                "mode": "Incremental",
                "templateLink": {
                    "relativePath": "childTemplate.json",
                    "contentVersion": "1.0.0.0"
                },
                "parameters": {
                     "parameter1": { // Value for parameter1 of linked template  <<<<<<<<<<< CLICK ON parameter1 HERE
                        "value": "[parameters('parameter1')]" // Reference to top-level parameter1 in main template
                    }
                }
            }
        }
    ]
}

1229.parameters.json:

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "parameter1": {
            "value": "param1 value in params file"
        }
    }
}

childTemplate.json:

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "parameter1": { // parameter1 definition in child template
            "type": "string",
            "metadata": {
                "description": "description"
            }
        }
    },
    "functions": [],
    "variables": {
        "variable1": "[parameters('parameter1')]" // Use of parameter1 in linked template
    },
    "resources": [],
    "outputs": {}
}

REPRO:

1. Click on parameter here:
   
   RESULT:
   
   EXPECTED:
   The top-level 'parameter1' should not be in the references.
   Possibly the actual definition of 'parameter1' in childTemplate.json should be in the references.