Yes, it is because of halloween.
An old special event.
Mohang also did a thing for 1.7 where zombies/skeles have a 50% to spawn with a pumpkin on their head ;P
thank you, I just wanted to make sure I didn't break anything
Actually, it does break stuff 
Crash upon loading world
World Gen Crash
Both crash logs of the function not working right pre 1.6 
Moved to support section.
this embedded event (that have date encrypted for no reason, also it will run on april first and 28th november)
it's possible to disable it if needed, everything you need to reflect single field and set it to false (or force set to true if you want permanent event)
