I was mining in my singleplayer minecraft world and I tried to mine some coal, but when the block broke it didn't drop anything. I walked around a bit and tried to mine some other stuff, but I was teleported back to the spot with the coal. It was like lag, but in singleplayer. Now when I try to get into the world I am sometimes taken back to the title screen. And when I do get in, I appear in the void for like 20 seconds before my world loads (this doesn't happen with my other worlds). It also sometimes crashes, and I've attached the crash report. I tried deleting the bin file and reloading, but it didn't help.