I was running around in an minecraft realm and out of nowhere chunks started disappearing when i reloged it was fixed butafter 10 min they sometimes come back (other people do see the chunks how it should) and only i fall down when i walk trough them at this moment i could not reproduce this but i where able to film the feed where i got some proof the vid is to large to attach to this bug report but i made an download link for if you really want to see it ( https://anonfile.com/Jd7eAdZ5nb/mc_bugg_mp4 )