Bizarre End-Related Structure Generation in 1.10 World Played in 1.11

Surreal structures are generated in the preexisting terrain of a world generated in 1.10 opened in 1.11. Irregular floating islands made of grass paths and beetroot are sporadically placed, seemingly near mountains, end rods are embedded within mountains and hills and placed everywhere underground, end bricks and stairs are found rarely on mountains, and there are at least two irregularly-shaped obsidian platforms that periodically spawn shulker boxes in some pattern above them. Other end-related blocks can be found both over and underground. There is also a clearly defined chunk boundary between old and new terrain.