My render controllers for a custom mob won't work and I need help (Minecraft Bedrock)

(copied from another website still written by me)

So I made a mob( mouren ,in this article) and wanted them to sleep like vanilla foxes,but my render controller had failed to work--which means my new mobs show the two head models at the same time.

The animations are alright,though the heads never do hid.

the controller contents are as followed:

{
  "format_version": "1.8.0",
  "render_controllers": {
    "controller.render.mouren": {
      "geometry": "Geometry.default",
      "part_visibility": [
        { "head": "!query.is_sleeping" },
        { "head_sleeping": "false" /*"query.is_sleeping"*/ }
      ],
      "materials": [ { "*": "Material.default" } ],
      "textures": [ "Texture.default" ]
    }
  }
}

I've checked my grammar/input and even my model,but the truth is that this controller had never worked (and maybe not even loaded,since there wasn't anything related to rendering in the game log).

Does anyone know what was wrong with it?