When this villager improves his rank with trades, particles start to appear and then I can't do anything because the world acts like I has lag. When I quit the game, the "Saving World" text appears, it stays like that and I must close it with Task Manager. Also when I open again the world, it leaves me in the same start of the video, I tried to do things like break the minecart before trading or trading diferent items but the bug continues. This world is a single-player world.