In my survival world I went into the nether a couple days ago and there was about 10 overworld mobs around the portal, such as zombies and spiders, and i thought it was no big deal. However, today when i went through the portal it first took about 2 minutes to load, and then when i was through I couldnt move it was so laggy, and there were hundreds of phantoms. I can neither kill them nor go back through the portal as there are so many and its so laggy. Is there anything I can do to fix this or get rid of them? and is there any explanation as to why it might have happened? I have attatched a game recording from my xbox, which is where i quit the game then loaded the world back up again. The first 20 seconds or so is it loading but then the last ten seconds you can see all the phantoms.