Some of the patch notes from 1.8:
Iron Golems:
Now only drop iron when killed by the player, either through combat or potions, or player-activated mechanisms such as manually lit TNT
If killed without player intervention, only drop poppies
Zombie Pigmen:
Now only drop gold nuggets/gold swords when killed by the player, either through combat or potions, or player-activated mechanisms such as manually lit TNT
If killed without player intervention, only drop rotten flesh
Which means:
Any current gold farms will need to be switched over to manual farms where you hit the zombie pigman with sword, similar to monster spawner farms.
Iron farms won’t work at all, due to changes in villager breeding requiring trading.
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