Not using <base href="~/">

I have the following in the layout:

<script src="~/_framework/blazor.server.js" autostart="false"></script>
    <script>
        Blazor.start({
            configureSignalR: function (builder) {
                builder.withUrl("/_blazor");
            }
        });
    </script>

When I navigate off the page, the browser is invoking:

https://www.mydomain.com/relative-path/_blazor/disconnect
instead of
https://www.mydomain.com/_blazor/disconnect

the blazor js client should respect the signalR configured path for all server invocations, not just negotiate and the websocket connection