Ok so I generated a new world and after walking around for a bit a stumbled across this:
It's a base with a shadow manipulator, a tent, a chest, a crock pot, 2 beeboxes, some twigs and bushes, and a bunch of stone walls. It even has some wood flooring beneath it.
When I saw this I was so spooked because I'm playing on a solo world. Is this a new setpiece? Has anyone else found this? How rare is this?
here is the seed: 1627102929 (works on version 470691)