During my modded playthrough of 1.7.10, I noticed that my nether portal textures and end portal textures didn't even exist! With the help of 7z, I was able to get both textures from 1.12.2 and put it into a texture pack so I don't get the missing texture thats similar to when you don't install Counter Strike Source on Garry's Mod! Now I don't have to see that mind screwing texture!