Entire chunks (exactly one chunk wide) have just vanished.
This happened to my last world from a year ago as well. But back then I was using Random Terrain Generator and thought it was their bug. However, it’s happening again.
I don’t even know where to begin diagnosing this problem since it’s so random and no one I’ve asked has ever had any similar problems.
Running Pixelmon, Spongeforge, Pre-genned with Nucleus. Don’t have any other mod/plugin that would affect terrain
Edit: The swamp next to it has also been turned to an ocean biome… corrupted?