The new realeased snapshot, 18w47a, has a bug where dirt and farmland blocks appear out of nowhere, some have even flipped position. Here I have provided screenshots.
Related issues
Attachments
Comments
migrated
[media][media][media][media][media]
MaskOfLoki
Can confirm this is happening. Caught it on video: https://youtu.be/p12toBF2MAM
migrated
Thanks for the video, it's like the dirt blocks that were on the surface got flipped in my basement destroying one of my chests too