Not come across this one before. Just started a new project ozone void world today and I've got Ghasts spawning near to my island!! The only thing I could find online about them spawning in the overworld was something dated 5 yrs ago and they could only spawn if there was a nether portal near by, over blocks with enough space, and the right light level? This I could accept but I don't have a nether portal yet, it's a void world, and it was the middle of the day in the open!!
So How are they spawning? Is it a mod and if so which one?