Effect of updating a resource's property in incremental mode - armtemplate.json

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "vnetName": {
            "defaultValue": "vnet01",
            "type": "String",
            "metadata": {
                "description": "VNet name"
            }
        },
        "vnetAddressPrefix": {
            "defaultValue": "10.0.0.0/16",
            "type": "String",
            "metadata": {
                "description": "Address prefix"
            }
        },
        "subnet1Prefix": {
            "defaultValue": "10.0.0.0/24",
            "type": "String",
            "metadata": {
                "description": "Subnet 1 Prefix"
            }
        },
        "subnet1Name": {
            "defaultValue": "Subnet1",
            "type": "String",
            "metadata": {
                "description": "Subnet 1 Name"
            }
        },
        "subnet2Prefix": {
            "defaultValue": "10.0.1.0/24",
            "type": "String",
            "metadata": {
                "description": "Subnet 2 Prefix"
            }
        },
        "subnet2Name": {
            "defaultValue": "Subnet2",
            "type": "String",
            "metadata": {
                "description": "Subnet 2 Name"
            }
        },
        "location": {
            "defaultValue": "[resourceGroup().location]",
            "type": "String",
            "metadata": {
                "description": "Location for all resources."
            }
        }
    },
    "resources": [
        {
            "type": "Microsoft.Network/virtualNetworks",
            "apiVersion": "2021-08-01",
            "name": "[parameters('vnetName')]",
            "location": "[parameters('location')]",
            "properties": {
                "addressSpace": {
                    "addressPrefixes": [
                        "[parameters('vnetAddressPrefix')]"
                    ]
                },
                "subnets": [
                  {
                    "name": "[parameters('subnet1Name')]",
                    "properties": {
                      "addressPrefix": "[parameters('subnet1Prefix')]"
                    }
                  },
                  {
                    "name": "[parameters('subnet2Name')]",
                    "properties": {
                      "addressPrefix": "[parameters('subnet2Prefix')]"
                    }
                  }
                ]
            }
        }
    ]
}