Zombie not picking up items

what is the output of /gamerule mobGriefing
if false, that's intended, also only very little zombies/skeletons/zombie pigman can pickup items

Zombies cannot pickup blocks, only endermen can do that. WAI.

yes they can, the'll pick up dropped items and equip them, that was added back in 1.4

That was the first thing I double checked FVbico. That is not the cause. It appears like it but mobGriefing is true. Also I stated that I tested on a Flat world, 100+ zombies and no item pickup.

not sure, but maby difficulty may be causing it, correct me if I'm wrong

Are you Dutch too...?

Nearly, eastern neighbour. _{(Read: German)}

Tested in 1.8.2 pre-1. Zombies on hard difficulty will pick up items, on normal and easy they will not. I would assume this is intended, although the wiki says they should pick items up on normal as well.

Zombies on hard difficulty will pick up items, on normal and easy they will not

No, see my screenshot in normal difficulty. As already said, the local difficulty does count here too.

I'm saying that when I tested it, they didn't pick anything up when I was on normal.