At a random point in my Minecraft world, going into the Nether or the End would cause the game to freeze on the "Building Terrain" screen. After restarting the game, I would be teleported to the coordinates of my portals in the Overworld, in other dimensions. For example, if my Nether portal coordinates in the Overworld were 100, 60, -100, I would be teleported to those coordinates in the Nether when restarting the game. The same applies to the End. I've lost loot I've grinded hours for to this glitch from either falling out of the world or dying in lava. This issue did not occur until recently in my world, prior to the 19.1.20 update. Even after the update, the same issue is happening. It makes going to the End or Nether impossible without dying. For more details, the world has "Experimental" switched on, along with the Wild Update. I hope this issue is resolved soon.