I honestly don't know what happened. I know it happened after I put in Player in the first spot in a Jigsaw Block because I was playing around. The game crashed, I opened the world, and then there's bamboo in the corner chunks (ex: chunk 1,1 2,2 3,3 etc. and the same in the negative,negative direction, but not the positive,negative or negative,positive directions). Those chunks, but just the bamboo, have the disappearing and reappearing blocks bug from the first 1.14 snapshot. I was in a Buffet world with island generation and Bamboo Forest biome.