Don't know if this counts as an art problem or an event problem, but the Delphi Carnival is still displaying the Morostide artwork (both day and night). I use Firefox as a a browser, and noticed this since Monday 11/25/19 and it's still going on as of right now. (5:00pm Subeta time)
It's been said in some of the news comments after Morostide that this isn't a bug and they were supposed to be doing something with it around Black Friday time. I'm not sure if that's still going to happen though, since there are still some issues with the site going on.