Scripts Don't Execute Without Devtools Open

[limitedAtonement]

I'm using Chromium on Arch Linux. I am new to TamperMonkey, so it's likely I'm just doing something wrong. Here is my script:

// ==UserScript==
// @name         Fix Walmart
// @namespace    http://tampermonkey.net/
// @version      2024-09-05
// @description  fix walmart
// @author       You
// @match        https://www.walmart.com/orders*
// @icon         https://i5.walmartimages.com/dfw/63fd9f59-fd82/d9c2b350-71fe-4bc2-be43-23fd97630434/v1/Walmart+_Logo_mweb.svg
// @grant        none
// ==/UserScript==

function hideSidebar() {
    const element = document.querySelector('.flex>.dn.br.b--black-10');
    console.log("tampermonkey; hiding sidebar. got element", element);
    element.style.display = 'none';
}

async function viewDetailsLink() {
    const buttons = document.querySelectorAll('main>section section>div>div>div>div>span>div>button');
    console.log("tampermonkey: view details link, got", buttons.length, "buttons");
    for (let i = 0; i < buttons.length; ++i) {
        // The default listener appears to be mousedown. By overriding mousedown, we eliminate the default
        //action and replace with our own
        const orderNumber =buttons[i].ariaLabel.split(' ').at(-1);
        buttons[i].onmousedown = ()=>window.open('https://walmart.com/orders/' + orderNumber, '_blank').focus();
    }
}

// The site is a SPA, so it changes dynamically without us knowing about it
setInterval(hideSidebar, 1000);
setInterval(viewDetailsLink, 1000);

When I go to walmart.com/orders, the page is not affected (I expect hideSidebar() to hide the sidebar). When I open devtools then reload the page, the sidebar is hidden as expected.

I looked for a discord server or IRC channel to discuss this as it's likely PEBKAC, but didn't find anything.

Can I get the script to run when I visit the site without devtools open?