I've just noticed that a single chunk in my world appears to have regenerated. I am certain that this has happened very recently and I have confirmed this by looking at a backup of my world from a couple of days ago. The backup from a couple of days ago shows a complete wall and my current save shows the same wall with the regenerated chunk in the middle. Images are attached. My world seed is 6440625432857030074 and the chunk in question is chunkx = -74 chunkz = 17
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Please attach the logfile out of [minecraft/logs/|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
of the time of the incident.

Here are all of my minecraft logs that were made since the last backup of my world was made. I am 99% sure that the issue occurred today (2015-03-03) so those logs are probably the best place to look.

Yes, it's in one of today's logs:
2015-03-03-4.log
[18:16:22] [Server thread/ERROR]: Chunk file at -74,17 is in the wrong location; relocating. (Expected -74, 17, got -76, 15)
[18:16:22] [Server thread/WARN]: Wrong location! (-76, 15) should be (-74, 17), wb['Skeleton'/231, l='Legacy World', x=-1204.40, y=25.00, z=244.14]
[18:16:22] [Server thread/WARN]: Wrong location! (-76, 15) should be (-74, 17), wb['Skeleton'/232, l='Legacy World', x=-1205.55, y=25.00, z=242.15]
[18:16:22] [Server thread/WARN]: Wrong location! (-76, 15) should be (-74, 17), wb['Skeleton'/233, l='Legacy World', x=-1205.49, y=25.00, z=242.95]
[18:16:22] [Server thread/WARN]: Wrong location! (-76, 15) should be (-74, 17), vo['Creeper'/234, l='Legacy World', x=-1200.50, y=61.00, z=252.50]

Thanks for looking into this Kumasasa.
I just loaded up that world and I can verify that chunk -74, 17 is now identical to -76, 15.
Thankfully I make regular backups of my Minecraft worlds so I will be able to correct the chunk in question with my backup. (Proves the importance of making regular backups).
Goodnight and keep up the good work 🙂