I am in my own personal survival, no one else has joined it, and whenever I go through a portal, I sit on the "Building Terrain" screen for a while, then it loads me into the nether, but my screen still says "Building Terrain", and if there are any hostile mobs around, they can just kill me and I cant do anything about it because it still says "Building Terrain". After a while, it changes the screen to what it should be in the nether. It works completely fine to go back through the nether portal to the overworld. Idk what to do, pls help. I am on an iPad.