Patch StackExchange.realtime.reloadPosts to work with the new data format returned from /ajax-load-realtime/.

SE_Quick_fix_reloadPosts.user.js

// ==UserScript==
// @name          SE: Quick fix SE.realtime.reloadPosts
// @namespace     MakyenStackExchangeAdjustments
// @description   Patch StackExchange.realtime.reloadPosts to work with the new data format returned from /ajax-load-realtime/.
//
// @match         *://*.stackoverflow.com/*
// @match         *://*.superuser.com/*
// @match         *://*.serverfault.com/*
// @match         *://*.askubuntu.com/*
// @match         *://*.stackapps.com/*
// @match         *://*.stackexchange.com/*
// @match         *://*.mathoverflow.net/*
//
// @exclude       *://api.*
// @exclude       *://blog.*
// @exclude       *://chat.*
// @exclude       *://data.*
// @exclude       *://stackoverflow.com/advertising*
// @exclude       *://stackoverflow.com/talent*
// @exclude       *://stackoverflow.com/teams*
//
// @require       https://cdn.jsdelivr.net/gh/makyen/extension-and-userscript-utilities@94cbac04cb446d35dd025974a7575b25b9e134ca/executeInPage.js
//
// @version       1.0.0
// ==/UserScript==
/* globals StackExchange, $, makyenUtilities */

(function() {
    'use strict';

    function inPagePatchSEReloadPosts() {
        StackExchange.ready(() => {
            //2022-03-09 Patch an issue with realtime reloading posts.
            //The code in reloadPosts uses only the .then() from $.ajax, so we don't need to fully
            //  support all possible options when temporarily replacing $.ajax.
            const origSEReloadPosts = StackExchange.realtime.reloadPosts;
            StackExchange.realtime.reloadPosts = function() {
                const origAjax = $.ajax;
                $.ajax = function() {
                    return origAjax.apply(this, arguments).then((response) => {
                        try {
                            return JSON.parse(response).Html;
                        } catch {
                            return response;
                        }
                    });
                }
                const toReturn = origSEReloadPosts.apply(this, arguments);
                //We only want this change to $.ajax to be effective for this call to reloadPosts, so put it back.
                $.ajax = origAjax;
                return toReturn;
            };
        });
    }

    makyenUtilities.executeInPage(inPagePatchSEReloadPosts);
})();