Almost all blocks are missing in my world except for a few, I dont think its possible to replicate, but heres what I think happened.

I was having fun and putting in a lot of entities, snow golems fighting skeletons, and stuff like that. Then some chunks disappeared, I restarted the world, and now almost everything is invisible, but still there. I think there was just a ton of entities, so much that it corrupted something. Someone joined my world, and everything's there for them.

File was too big. https://www.youtube.com/watch?v=93Fs3M0rU8U