### 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)

} else if (mode == MODE_USE_COUNT_PROPERTY) {
			List<PropertyInfo> object_property_list;
			object->get_property_list(&object_property_list);
			Array properties_as_array = _extract_properties_as_array(object_property_list);
			properties_as_array.resize(count);
			
			undo_redo->add_undo_property(object, count_property, count);
			for (int i = count - 1; i > p_size - 1; i--) {
				Dictionary d = Dictionary(properties_as_array[i]);
				Array keys = d.keys();
				for (int j = 0; j < keys.size(); j++) {
					String key = keys[j];
					undo_redo->add_undo_property(object, vformat(key, i), d[key]);
				}
			}
			
			undo_redo->add_do_property(object, count_property, p_size);
		}
	}
	undo_redo->commit_action();
	
	emit_signal(SNAME("page_change_request"), 0);
	/*
	count = 0;
	begin_array_index = 0;
	end_array_index = 0;
	max_page = 0;
	*/
}
Array EditorInspectorArray::_extract_properties_as_array(const List<PropertyInfo> &p_list) {