Nothing is spawning on skaro, at the city daleks only spawned the first time I went there, nothing was in an asylum and I went to the dalek Emperors ship and his casing is empty!
We it seems to work on new worlds and the dalek Emperor atleast spawned when I reset the dimesnion via deleting the file but he barely had any guards and there was no reward if there was supposed to be. But yeah works perfectly fine one new worlds, I would hate to have to start over my survival world.
Well mob spawning doesn't seem to work well on new worlds either, dalek emperor works but can't find any hostile mobs and trenzalore or Vortis... even by ships.