"Load more comments" not working on the old layout [desktop web][chrome]

Some time within the last few hours the 'load more comments' option when browsing comments on the old reddit layout has stopped working for me, across all my available browsers and devices (Chrome and Firefox on Windows, Chrome on Android)

The link is replaced with "loading..." which remains indefinitely. If I open the direct link to the relevant comment I can continue the thread and see more comments just fine, but they won't load in line with the main comment section.