Trailing data encountered "COMMAND"

[Kraggle09]

In the dialog generator, if I add a command as an action, it'll say Trailing data encountered: "COMMAND (without /)

Example json:

{
  "type": "minecraft:multi_action",
  "actions": [
    {
      "label": "",
      "action": {
        "type": "minecraft:run_command",
        "command": "/say test"
      }
    }
  ]
}

It ignores the / when listing the command, but having the command without the / is still flagged.

The code still works in game, but the generator flags it.