So I got on one day and found that a part of my community farm went back to how it was before (before i dug it up) I'm not sure what I did when all I did was play if anyone can help me out that would amazing. I'm on the Mac btw. And contact me on Twitter: MoralHoody if you got the solution (and I got more photos to show as well) thank you!
The game has known issues with chunk corruption, mainly chunks moving around, even in the absence of crashes or improper shutdown, so you may be able to find the "regenerated" chunk somewhere else in the world:
If you don't have a backup you can try right-clicking on the folder for the world and select "restore previous versions" (on Windows, I don't know if Macs have a similar feature or other automated backup) and there may be a backup from before the issue occurred; otherwise, always treat any important data as if it could be corrupted/lost at any time (i.e. make regular, multiple backups, ideally to a completely different location, not just to the same drive or device).