Zombies drop rate

Chance of zombies dropping iron items has been dramatically reduced, possibly because of the new "only-can-drop-if-wielding" chance, which didn't remove the drop chance making the drop a multiplication between these two chances making it almost impossible to get a drop (I killed over 3000 zombies from a spawner without any iron item drop, only carrots, potatoes and iron ignots which seem the keep a normal drop rate)