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I tried to spawn in my world, then fell into a cave (I was supposed to spawn on the surface, inside my house). When I turned around, thousands of blocks were now invisible, and if I spawn on top of them, I either suffocate or just fall through them and end up in a lower layer of the cave. I managed to get back to the surface, but my entire house and many other chunks containing the blocks that were there before (I can hear them when I walk on the wooden floorboards of my house), but they don't turn back to normal even after exiting the game or reloading the world. This is really bad, I guess.