Earlier today, I logged back into a very developed world that I have been working on for quite a few months now. This time when I logged in, every block that I had interacted with had disappeared.

I had an iron farm and a raid farm and an XP farm on the surface and they are all gone. The village that I live near didn't have any villagers, but when I logged in today, all the villagers were back. I also had an underground base that is now gone.

All the items that were in my inventory at the time are still there, but all the blocks are gone. Last time I played it was on the 19w37a snapshot.

Username: Nox_ES73