It happened after I logged into the world. Around my house there were extremely noticeable chunks missing. Loading wasn't the problem, as I was even able to jump in them and die in the void. Before this happened, I had attempted to login to my world. I got the error message that said "There was a problem loading this world." I used this guide to fix it- https://youtu.be/dARRKHrt1xM.

The only thing that I think might have caused this is my afk fish farm that I built. My reasoning is because these problems only happened after I made it (Not immediately). The video that I followed to make the farm is here- https://youtu.be/eRzvl80-UpQ.