Google assistant triggers: event data has different shape when activating scripts?

Configuration
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I have a google assistant integration which I use to trigger actions in Home Assistant, and I find that when I do this, I get an event in a different shape to the one I get when I trigger the action manually. This seems weird and I wonder if I’m doing it right.

I set it up like this:

  1. Add the Google Assistant integration via a Nabu Casa subscription.
  2. Create a script called “Night mode” with no sequence. This creates an entity called script.night_mode
  3. In Node-RED, add a “call service” node, and feed that into a debug node.
  4. Trigger the script in various ways:
    • A: Say “Hey Google, activate Night Mode”
    • B: Click the run icon on the Configuration > Scripts page of home assistant
    • C: Call the script.night_mode service in Developer tools

When I do A (talk to Google), I get:

{
	"event_type": "call_service",
	"event": {
		"domain": "script",
		"service": "turn_on",
		"service_data": {
			"entity_id": "script.home_mode"
		}
	},
	...
}

But if I do B or C (call the script from inside HA), I get:

{
	"event_type": "call_service",
	"event": {
		"domain": "script",
		"service": "night_mode",
		"service_data": {}
	},
	...
}

Is this expected? Am I doing something weird?