I have no clue how the bug happened but I recently created a world and I've made a couple videos on the work of me time lapsing my build. And once I've played on the world for a little bit it just randomly started taking 100% of my cpu. Other world's don't do this but this one is seeming that. I've disabled everything and it still persists. The world is about 30 mb when I copied the world it was 30mb and it seemed to run really well once I went towards 0,0 the CPU went up again. I teleported to my command blocks at 1000,5,1000 and deleted all my ticking areas. I only had 2 at size 4. When I teleported back to spawn the CPU went up and the game froze. A few seconds later my PC said it ran into a problem and needed to restart. I can be on it for hours but when I load the world everything seems to break.

I'd of recorded a video and sent it but the video to show this is too long.

On any other world my CPU usage is about 20% but on this world and all its its copies it's about 100% and somehow the base world was 30mb but when I exited the copied world the copy was 70mb???

I can possibly send the world to someone if they want to run tests.