Decompile fails with "Value cannot be null. (Parameter 'value')" when nested template parameter doesn't have a "value"

```jsonc
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"lookup_Topology": {
"type": "string",
"metadata": {
"description": "description"
},
"defaultValue": ""
}
},
"functions": [],
"variables": {
"deploymentApiVersion": "deploymentApiVersion"
},
"resources": [
{
"type": "Microsoft.Resources/deployments",
"apiVersion": "[variables('deploymentApiVersion')]",
"name": "Topology",
"properties": {
"mode": "Incremental",
"templateLink": {
"uri": "[parameters('lookup_Topology')]",
"contentVersion": "1.0.0.0"

},
"parameters": {
"cloudInstance": {
"value": "abc"

},
"stamp": {
"type": "def" // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

},
"environment": {
"value": "env"

}

}

}
}

],
"outputs": {}
}
```
```
4:56:02 PM: Decompiling c:\Users\stephwe\Repos\abc\bug2.json into Bicep...
Decompilation failed. Please fix the following problems and try again: Value cannot be null. (Parameter 'value')
```

You can also repro with Paste as Bicep by pasting the following shorter text:
```json
{
"type": "Microsoft.Resources/deployments",
"apiVersion": "[variables('deploymentApiVersion')]",
"name": "Topology",
"properties": {
"mode": "Incremental",
"templateLink": {
"uri": "[parameters('lookup_Topology')]",
"contentVersion": "1.0.0.0"
},
"parameters": {
"cloudInstance": {
"value": "[reference('Common').outputs.cloudInstance.value]"
},
"stamp": {
"type": "[variables('stamp')]"
},
"environment": {
"value": "[variables('environment')]"
}
}
}
}
```

Use the supplied full template and the shorter Paste as Bicep JSON as reproducible cases. Start by running both through decompilation and trace the handling of nested deployment parameters; done means neither input produces the null-value failure and both decompile successfully.

Written by the indexing model from the issue text.