ARM Microsoft.ServiceBus/namespaces/topics path property - azure

Question

I am trying to understand what is the purpose of the path property for Azure Service Bus Namespace topic.
The template is provided here Create a Service Bus Namespace and Topic but based on Microsoft.ServiceBus namespaces/topics 2017-04-01 ARM template reference it should not be present.
I have tried to export the template for some existing namespace topics and this path property is missing.
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"serviceBusNamespaceName": {
"type": "string",
"metadata": {
"description": "Name of the Service Bus Namespace"
}
},
"serviceBusTopicName": {
"type": "string",
"metadata": {
"description": "Name of the Service Bus Topic"
}
},
"location": {
"type": "string",
"defaultValue": "[resourceGroup().location]",
"metadata": {
"description": "Location for all resources."
}
}
},
"resources": [
{
"apiVersion": "2018-01-01-preview",
"name": "[parameters('serviceBusNamespaceName')]",
"type": "Microsoft.ServiceBus/namespaces",
"location": "[parameters('location')]",
"properties": {},
"resources": [
{
"apiVersion": "2017-04-01",
"name": "[parameters('serviceBusTopicName')]",
"type": "topics",
"dependsOn": [
"[resourceId('Microsoft.ServiceBus/namespaces/', parameters('serviceBusNamespaceName'))]"
],
"properties": {
"path": "[parameters('serviceBusTopicName')]"
},
"resources": []
}
]
}
]
}