Huh, that’s the first I’m seeing that, but this is also the first timewalking event since the new expansion dropped. I would absolutely make a post over in the Bug Report forum. Devs don’t come here to collect feedback, but posting there will get it looked into if it’s not working as it’s intended to work.
The only thing I’m seeing is where they are not allowed to queue for legacy content until after 24 hours - and that article was updated two months ago. I don’t know if that is still supposed to be as intended for the special event week, so please do submit a Bug Report.