Deleted progress

I went into Minecraft as I normally do, and noticed that 1.14.4 was out. I clicked the latest version and everything was running as normal until I opened my world. I looked around and immediately noticed that all my builds were gone as if the world had reset. Some of the controls like auto-jump also reset, which was not on before, and also got new achievements that I have gotten previous to this. I still had all my items in my inventory and my experience, so I figured something was up and assumed it was a bug of some sort. I had optimized the world before playing it, which may have contributed to the problem but I am not completely sure. I just hope that I can fix this and not have to rebuild my world.