I have had the first world I ever created since 1.2, and lately I decided to play it, anyway when I loaded the world It totally wiped the chunk I was in and reset it. When I came back again it wiped a different chunk, again, and I nearly died in blocks, when I kept trying I noticed it was generating in the older terrain generator, and it was keeping entities
Related issues
duplicates
Attachments
Comments

[media]

Please attach the logfiles from .minecraft/logs/<DATE>.gz
from the time the chunk replacement happened.

this is the log file of the day it happened