I fixed it now. I put world into peaceful mode and let it load for about an hour. I don't know how to delete this project
I think it may be too many guardians, I made a copy of my world and put it into creative. Used the /kill command and a bunch of guardians were killed. However after they were killed, I still cant leave the nether because the portals don't work. I tried putting it in peaceful mode in the menu and loading in, but that doesn't work. I would've exported my world to a usb stick or just a folder on my desktop, and then deleted minecraft and re-installed it. However I can't because everytime I try to export, the file size always ends up being 0KB. Btw the file size is 200mb.
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So what do I do? I guess I wait for a bug fix meaning that I can't play for the time being?