syntax-fm-sticky-show-notes.user.js

// ==UserScript==
// @name         Syntax.FM - Sticky Show Notes
// @namespace    salembeats
// @version      1.2
// @description  UPDATE: Reset scroll position when show notes change.
// @author       Cuyler Stuwe (salembeats)
// @include      https://syntax.fm/*
// @grant        none
// ==/UserScript==

const topOffset = "102px";

const showNotesEl = document.querySelector(".showNotes");

showNotesEl.style = `
    position: sticky;
    top: ${topOffset};
    height: calc(100vh - ${topOffset});
    overflow-y: scroll;
`;

new MutationObserver(mutations => {
    showNotesEl.scrollTop = 0;
}).observe(showNotesEl, {childList: true, subtree: true});

1.2:

Reset scroll position when show notes change.