Sidebar disappears when linking to an anchor or using the table of contents on WCAG 2.2 web page if Reduced Motion is turned on

[amberhinds]

This issue pertains to https://www.w3.org/TR/WCAG22/ please let me know if I am not posting it in the right place.

In multiple browsers, after clicking one of the anchor links in the table of contents or if linking directly to the page with an anchor appended on the URL, the table of contents sidebar disappears and cannot be restored.

Here is a video that shows the behavior I am seeing.

There are no console errors.

When I inspect the code, this appears to be a bug related to the prefers reduced motion CSS:

@media (prefers-reduced-motion: reduce) {
    body.toc-sidebar #toc {
        position: absolute;
        overflow: initial;
        bottom: unset;
    }
}

I do have reduced motion turned on in my OS. If I turn off reduced motion, the sidebar stays visible when interacting with it. If I inspect the code and disable the position:absolute in the reduced motion media query above, it works as expected.