this helps to find out which parent has an "overflow" settings that might cause issue with sticky.

Sticky-element-debugging.js

    let parent = document.querySelector('.sticky').parentElement;

    while (parent) {
        const hasOverflow = getComputedStyle(parent).overflow;
        if (hasOverflow !== 'visible') {
            console.log(hasOverflow, parent);
        }
        parent = parent.parentElement;
    }