I have a problem on my external server, the Dimension of the End has a bug, it doesn't spawn the ender dragon again and it doesn't generate the portal that takes you back to the overworld, I can't reset the world because I have a lot of things built in it, but I already tried to delete the Dim1 folder to see if it reset the End and nothing worked, I tried to get a different Dim1 folder and it comes with the dragon and the return portal but the dragon does not have the purple life bar, and when you kill it it does not does it generate the portal to return to the overworld, any tips on what I can do to fix this problem?