uploadProgress function not working in Microsoft Edge

This just started recently, probably after an update to either Edge or Windows 10.

The uploadProgress function is not triggering until the upload is complete. It works fine in Chrome, Firefox and Internet Explorer. I've just downloaded the latest version of jquery.form.js and the issue is the same.

            uploadProgress: function (event, position, total, percentComplete) {
                if (running === false) {
                    running = true;
                    parent.postMessage("status|running","*");
                }
                var percentValue = percentComplete + '%';
                bar.width(percentValue);
                bar.html(percentValue);
            },

Start in jquery.form.js and inspect how the uploadProgress callback is wired for XMLHttpRequest uploads. Reproduce the reported behavior in Microsoft Edge using the supplied callback, comparing it with Chrome, Firefox, and Internet Explorer. Done means progress callbacks fire during the upload rather than only after completion, without regressing the other browsers.