i dunno what changed, but im in a place right now in the nether where i litterally cannot not have a ghast near me, ive died twice because of this and now dont have the bow i was using to kill them like two spawn in front of me (well within the block spawn range) and as i kill one i turn around to kill the other and another one spawns right next to him. wtfbbq?!
Another thing is, if a ghast spawns in confined space, he can "see" through blocks, and will fire in your direction. If you don't move, it can happen that the ghasts blows out a tunnel through netherrack towards you and kills you.
