Nether Not Loading Correctly

When I create a nether portal and go in the nether for the first time, everything works just fine, and I can get back home without anything going on. However, the second time (and multiple, multiple times after that) I went into the nether and mobs wouldn’t move, and as I moved a little further from the portal, side textures of blocks wouldn’t load in. As I moved to the nearby fortress, there were still no side textures, but I also couldn’t open chests, and I couldn’t break blocks. Then, I tried going back to the overworld, but it wouldn’t let me through the portal (I would only get the purple swirly animation). After, I tried pausing, but I was only met with a loading screen, forcing me to manually close the app. When I went back in the world, it took me back to the overworld, so I tried again, with the same results. After multiple tries, it wouldn’t even let me in the world, as it left me on the loading screen, where it says “building terrain.” I tried even more after that, and then it let me in (once), but I spawned in the nether this time, but literally nothing loaded in. I could still look around, but there was only void. Then, I had to force quit again, and now it won’t let me in the world, and it won’t let me even copy the world to try to get in that way. I’ll leave a couple attachments down below to show what I’m talking about with the side textures not loading, the pause screen loading, and the void.

EDIT: Another thing that I noticed was that mobs completely stop moving, and you can’t hit them or anything as well. I had tried to go into the Nether in another world and some bees had gone through the nether portal. They didn’t move, and hitting them didn’t do anything. I should also note that this happens in both creative and survival mode.