In the meanwhile, you can use this JQuery code to correct the link from user/ to /channel, this will fix both regular website and mobile in the smart layer.
function changeURL() {
// Code to do stuff after 2s
$("[href='https://www.youtube.com/user/YOUR-YOUTUBE-ID?sub_confirmation=1']").attr("href", "https://www.youtube.com/channel/YOUR-YOUTUBE-ID?sub_confirmation=1");
}
$(document).ready(function () {
// Handler for .ready() called.
setTimeout(changeURL, 5000);
});
Hope this help!