Sometimes after Opening Minecraft and selecting a world, the chunks get loaded wrongly. This happened to me in multiple worlds, even after deinstalling all mods and creating new worlds. Another Problem is, that using backups often does not work. If i load up a backup that i created before the bug occurred, it still displaces the chunks. Since i mostly Play in flat worlds, i do not know if this occurs in normal worlds too (if there is even a world loading difference between such worlds at all). I provided a screenshot as further information. This bug makes the game unplayable for me and has already destroyed worlds, in which i played since over a year and there does not seem to be a way to fix it on your own. I really hope this can be fixed...