We won't copy and paste. You have 1 day to move all things from world 1(/f home) (where your base is) to world 2 (/spawn). World 2 does not work with: Nether portals, End portals until world 1 is removed and world 2 becomes world 1... dam, repeating world so much. Portals dont work because theyre not in the original overworld, and a end2 or a nether2 won't create.
I did test a end portal, but i didn't test a nether portal.