Zombies not spawning on crumb pickups

Hello,

We use both PumpkinHead and ZombieRock. We were able to get pumpkinHead working by giving permissions to our default group but we can only seem to get zombierocks to work when players chop trees or mine nodes. We want the zombies to only spawn when crumbs are picked up... (tree stumps, metal and sulfur crumbs) but thats not happening even when we set ...

 "Pickup spawns": {
    "Can spawn from resource pickups": true,
    "Spawn chance (1-100%)": 100.0"

we tried setting the spawn chance to 100.00 but that didn't do anything regarding resource pickup (chopping trees and mining nodes will spawn a zombie just not when picking up a resource crumb). I've included our j.son i dont know what we're missing.

ZombieRocks.json

did you set the pickup permission ?

Thats our .json. Yes I believe we did. As I stated above. Giving permissions to the default group worked for pumpkin head however, not for zombie rocks. Please advise.