The hover name decoration doesn't work

[Mizuuta]

If I set a hover name decoration it doesn't show it, it just shows the minecraft default hovering text.

My Config

"admin": {
    "level": 50,
    "overrides": {
      "name_decoration": {
        "hover": {
          "action": "show_text",
          "contents": "hi!!!"
        }
      }
    },
    "permissionLevel": 4,
    "command_feedback": true,
    "commands": {
      ".*": "allow"
    }
  },