ik that u r very busy but i think dat zombies should return to /warp mob just soo that it is easier to get iron instead of trading with other players.
No Support I didn't know that they weren't at /warp mob as I never use it and if I need iron I either pay the 1 grass and get 1 or 2 iron. But I've now heard that the reason why they no longer spawn there is because it created A LOT of lag.