Up until very recently, the "Join the festive conversation" link correctly linked to mysterious melody. Now there's some kind of weirdness?

The link: https://subeta.net/explore/mysterious-melody What it redirects to: https://subeta.net/explore/news.php What that page shows when it loads:

(And yes, the image is supposed to say "File not found")

[edit]

The link on Kumos is also busted!

The link: https://kumos.subeta.net/explore/mysterious-melody What it redirects to: https://kumos.subeta.net/explore/mysterious-melody What it says when it loads:

Mine never worked the entire season