In the process of rebuilding the technological empire I had established, I would continue to spot my machines modifying themselves, as well as the even stranger occurrence of mobs and their AI completely freezing, causing them to face north and cease to interact with the environment, even if I punched a hostile one. Entrances to my mines closed themselves off with obsidian seemingly placed by someone. Every time I wasn't keeping an eye on a certain aspect of my world, it changed or completely disappeared.
(Entity Zero)