Ghast spawning in ps fields

[Winston]

Ghast are able to spawn in a ps field. Prevent-mob-spawn is turned on.
Ghast also spawn from eggs when summoned in a PS field.
Tested in nether, end, and overworld.
Doesn't spawn in a region.

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Edit: Apparantly this has been happening since near the end of 2012?

https://famcraft.com/index.php/topic,1260.0/nowap.html

[mathfreak2]

I second Winston. I watched it happen.