vnet cannot be re-deployed when connected to by other resource in the same script

[Larocceau]

I have an arm template that has a vnet + webApp connected to it:

    let vn = vnet {
        name "my-vnet"
        add_address_spaces [ "10.30.0.0/16" ]
    }
    let app= webApp {
        name "my-web-app"
        operating_system Linux
        runtime_stack Runtime.DotNet80
        link_to_vnet sn
        sku  WebApp.Sku.P0V3
  
    }

    let rg = arm {
        location Location.WestEurope
        add_resources [
            vn
            app
            ]
}

Initial deployment goes OK, but any further deployments fail, because they try to delete the vnet, but that is not possible as long as the webApp is connected to it

Workaround
remove the vnet integration from the webApp before running the deployment

az webapp vnet-integration remove -g {rgName} -n {webAppName}"