I added this to my config after finding out that NPC's weren't hurt by fire:

"fire can hurt npcs",

In the Entity Groups, I have this:

    {
      "name": "fire",
      "members": "FireBall, FlameExplosive, FlameThrower, BaseOven, FlameTurret, rocket_heli_napalm, napalm, oilfireball2",
      "exclusions": ""
    },

However, NPC's are not being harmed by fire. What am I doing wrong here? This is the entire config: https://pastebin.com/T14E49Lp