### Godot version

v4.0.beta.custom_build [eaf306e0b]

### System information

Windows 10

### Issue description

Selecting a `Window` node in the Editor's SceneTree results in the message
```
editor/editor_data.cpp:1058 - Parameter "p_node" is null.
```
and the Inspector shows empty content instead of the Window's properties.

I would expect, that clicking on a node in the SceneTree lets me edit the properties of the node.

Bisecting shows that this behavior got introduced in #71770

### Steps to reproduce

1. Create a Window node
2. Click on the Window node in the Editor's SceneTree

### Minimal reproduction project

N/A
Ref<Theme> base_theme = ThemeDB::get_singleton()->get_default_theme();
	List<StringName> theme_types;
	edited_theme->get_type_list(&theme_types);
	theme_types.sort_custom<StringName::AlphCompare>();
	bool item_reselected = false;
	edit_type_list->clear();
	TreeItem *list_root = edit_type_list->create_item();
	for (const StringName &E : theme_types) {
		Ref<Texture2D> item_icon;
		if (E == "") {
			item_icon = get_theme_icon(SNAME("NodeDisabled"), SNAME("EditorIcons"));
		} else {
			item_icon = EditorNode::get_singleton()->get_class_icon(E, "NodeDisabled");
		}
		TreeItem *list_item = edit_type_list->create_item(list_root);
		list_item->set_text(0, E);
		list_item->set_icon(0, item_icon);
		list_item->add_button(0, get_theme_icon(SNAME("Remove"), SNAME("EditorIcons")), TYPES_TREE_REMOVE_ITEM, false, TTR("Remove Type"));
		if (E == edited_item_type) {
			list_item->select(0);
			item_reselected = true;
		}
	}