Whenever I try to replace my realm with another world, it says an error occurred

When I try to replace my current realm with a different world, it exports my world correctly, then it initializes. It gets stuck there, to eventually say an error occurred. On Reddit many other people have had this problem. I will give realms+ a bad review on my YouTube channel if this problem isn't fixed. I love Minecraft realms, please don't ruin this for me.