hello, so i'm trying to make a modpack where the player is stuck in the end, but can access the nether later in the game, I was able to make the eternal portal teleport the player to the nether, but there's 2 problems:

• I can't return, the eternal portal in the nether side doesn't work, unlike when the target dimension is the overwolrd.
  -I spawn on the nether roof (not a big problem, the portal makes a hole in the roof, and sometimes it expose netherrack, sometimes...).