Can't load up world; Sent back to home screen to clear up storage space even though I have plenty of storage

Every time I try loading up a world, I get a message saying that I don't have enough storage and that Minecraft is unable to save my progress (I'll attach a screenshot). However, I have over 3 GB of internal storage and over 20 GB on my SD card. Not only that, but I was able to create a new world and it worked just fine, so I know that it definitely isn't because I don't have enough storage. I think this problem started once I updated Minecraft to the latest version.