Players cannot damage NPC's or Twig when seated in the minicopter. Even though they can when standing.

"name": "default",
"enabled": true,
"defaultAllowDamage": false,
"flags": "AuthorizedDamage, HeliDamageLocked, HumanNPCDamage, LockedBoxesImmortal, LockedDoorsImmortal, CupboardOwnership, SelfDamage, TwigDamage",
"rules": [
"anything can hurt dispensers",
"anything can hurt resources",
"anything can hurt players",
"npcs can hurt players",
"players cannot hurt players",
"players can hurt npcs",
"players can hurt heli",
"players can hurt horse",
"traps can hurt npcs",
"traps can hurt players",
"highwalls can hurt players",
"barricades can hurt players",
"teslacoil can hurt anything",
"npcs can hurt npcs",
"fire can hurt npcs",
"fire cannot hurt anything",
"mini cannot hurt mini",
"samsite can hurt mini",
"samsite can hurt players",
"heli can hurt anything"
]

Thanks, fixed this in the next update. You can temporarily fix this by adding the rule: anything can hurt npcs