For completeness here is mine. I will try yours and see if it works better.
// ==UserScript==
// @name eat my shorts
// @namespace http://tampermonkey.net/
// @version 0.1
// @description change links to youtube shorts to reguler site
// @author jrs
// @match https://www.youtube.com/*
// @icon none
// @grant none
// ==/UserScript==
(function() {
'use strict';
function eat_shorts() {
const root = document;
const shorts_re = /^\/shorts\/(.*)/;
const ae = root.getElementsByTagName("a");
for (var i = 0; i < ae.length; i++) {
const this_a = ae[i];
const short_match = shorts_re.exec(this_a.getAttribute("href") );
if (short_match) {
this_a.setAttribute("href", "/v/" + short_match[1]);
}
}
}
const config = {
attributes: false,
childList: true,
subtree: true
}
//timer resets every time the returned function is called
function make_reset_timer(cb, timeout) {
var timer = setTimeout(cb, timeout);
function reset_timer(mutation_list, observer) {
clearTimeout(timer);
timer = setTimeout(cb, timeout);
}
return reset_timer;
}
const short_observer = new MutationObserver(make_reset_timer(eat_shorts, 10));
short_observer.observe(document, config);
})();