Okay so here is the deal. After two world saves, the next time I come online, the whole world in wonkey. The chunks get moved around, creating a very inorganic landscape, all advancements disappear, all chests and beds are gone except for hitboxes, all my stuff is gone and everything inside chests is also gone. This has happened to two worlds. The first time I thought it was a glitch but this is recurring. I don't know if this happens on 1.15.1 but it sure happens on 1.15. Also this might not happen on single player as I was playing with my brother on LAN. This is frustrating. Hours of work is just gone. I don't know why this happens and the mere fact of it happening surprises me since this was supposed to be a bug fixing update. This has to bee fixed. I have many screenshots and can even send the world saves. Please fix this. This annoys me so much. Please Mojang, take notice. You promised a bug fixing update and did not deliver. I am thoroughly disappointed. I hope to never see this happen again.
Regards
Ibrahim Vardag
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Hi! This is a known issue (see MC-161823). However, we need YOUR help in order to be able to fix this problem for good.
More specifically, we need the game logs from both before and after the chunks in that world got corrupted. You can find them in .minecraft/logs
. If possible, please attach or link to a backup of the world before the corruption as well.
Edit: Also, please note that we can only really work with world saves if they are zipped. The way you have attached the world to this ticket, it cannot be opened or reconstructed into a regular world save folder.

Dear Violine1101
I am sorry. Since I am not tech savvy I did not know that you have to zip the save files. I also did do not have a backup of the world so here are the zipped saves:
https://drive.google.com/open?id=1ueolG4c2vqHuK8K-wIdeiENL2bi8QL7R
https://drive.google.com/open?id=1opCNUcGGbiWvEqvTjnvYA4Evefi7NoOi
Also, how do you know which log belongs to which save, kindly advise so I am able to send you the logs. Also is this problem fixed in 1.15.1 as I was playing in 1.15 .
Thanks and Apologies
Ibrahim Vardag