forge version: 47.2.4
InControl version: 1.20-9.0.4

tested with just minecraft, forge, and InControl

It seems like the "spawner" key for spawn.json is not working? I have the following in my spawn.json and the hostile mobs are still spawning:

[
  {
    "hostile": true,
    "dimension": "minecraft:overworld",
    "spawner": false,
    "result": "deny"
  }
]

while the following will prevent the mobs from spawning

[
  {
    "hostile": true,
    "dimension": "minecraft:overworld",
    "result": "deny"
  }
]

Will be fixed in the next version