i played on my minecraft world i have this world 5 years and today something strange happend some of my old chunks replaced in a trail of new .on my builds
idk how it happend. but i know its not something that supposed to happend.
i send screenshots in case you don't believe me.
for the protocol i played this world yesterday before i got to sleep and it was okay in the morning(today) not
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Duplicate of MCPE-150757

If you have a copy of the world before this issue happened, it would be helpful if you could attach it to MCPE-150757. If the world is too large to attach, you can upload it to a file-sharing site like OneDrive or Dropbox and share the link.