### Godot version

v4.0.beta17.mono.official [c40020513]

### System information

Window 11, Forward+, GTX 1060

### Issue description

Adding two theme variations in a row result to a  crash.

https://user-images.githubusercontent.com/93253123/217037249-1ce1d56d-beb6-4435-83ad-9f8a07fe0e96.mp4



### Steps to reproduce

1. Create a project.
2. Create a theme.
3. Double click to go in the theme editor.
4. Click on manage items buttons.
5. In the add type field type a name to add a type.
6. type another name to add a second type.
7. Crash.

### Minimal reproduction project

[ThemeVariationCrash.zip](https://github.com/godotengine/godot/files/10665863/ThemeVariationCrash.zip)

if (!object) {
		return;
	}
	
	const Variant args[3] = { p_path, object->get(p_path), p_advance };
	const Variant *argp[3] = { &args[0], &args[1], &args[2] };
	emit_signalp(SNAME("property_keyed"), argp, 3);
}
void EditorInspector::_property_deleted(const String &p_path) {
	if (!object) {
		return;
	}
	if (p_path.begins_with("metadata/")) {
		String name = p_path.replace_first("metadata/", "");
		EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
		undo_redo->create_action(vformat(TTR("Remove metadata %s"), name));
		undo_redo->add_do_method(object, "remove_meta", name);
		undo_redo->add_undo_method(object, "set_meta", name, object->get_meta(name));
		undo_redo->commit_action();
	}
	emit_signal(SNAME("property_deleted"), p_path);
}
void EditorInspector::_property_keyed_with_value(const String &p_path, const Variant &p_value, bool p_advance) {