STORY: This world was working just fine before, when I entered the Twilight chunks weren't loading and I couldn't go back through the portal, I was stuck like that for a day and then I loaded up my world, and for half a second it worked so I was able to jump back through the portal, to my overworld not loading as well.
Here's a link to a video I made showing what's wrong
Here's a link to a video I made showing what's wrong