Long story short, ghast, blaze, wither skeletons. old nether mobs, don't spawn even though our difficulty is set to normal. We tried restarting server numerous times but still won't work. Anyone got ideas to why this happens? Killed piglems and other mobs to reduce spawned entities but still didn't work. Tried spawning blaze with an egg in the nether and it despawns imminently, but when spawned in the over wold they live.