Thanks for responding, and unfortunately I can't upload the world. I can't even open it or replace a realm with it, it says I have a sync error or corruption. I looked through the Xbox file system to try and find it and it seems as though the only thing in the world folder is a SYNC_LOCK file
I've also been experiencing this on the Xbox 1.13 update. Thought it was because I was locking the furnace with a lever, but apparently not