Minecraft wiki entry for Things_not_to_do, associated text: In Minecraft worlds, there is a world border ‌[Java Edition only], which prevents the player from falling into fake chunks. However, the environment near this edge affects players, just as they did in the past. Huge lag spikes may occur, paintings and various textures become distorted, and entities spawn oddly all of which hindering the player's chances of survival. Not only that, the lava textures could become lopsided and thus the player could unknowingly step into lava because it becomes unnoticeable particles. Worse of all, if someone moves the world border, when the player is near the edge, then they cannot escape quickly and may die of damage from the world border. Sometimes, TNT can become an entity at another location then it was primed and could blow up things which the player does not expect.