### 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
bool still_selected = true;
	if (p_append && !editor_selection->get_selected_node_list().is_empty()) {
		if (editor_selection->is_selected(item)) {
			
			editor_selection->remove_node(item);
			still_selected = false;
			if (editor_selection->get_selected_node_list().size() == 1) {
				EditorNode::get_singleton()->push_item(editor_selection->get_selected_node_list()[0]);
			}
		} else {
			
			editor_selection->add_node(item);
		}
	} else {
		if (!editor_selection->is_selected(item)) {
			
			editor_selection->clear();
			editor_selection->add_node(item);
			
			if (Engine::get_singleton()->is_editor_hint()) {
				selected_from_canvas = true;
				EditorNode::get_singleton()->edit_node(item);
			}
		}
	}
	viewport->queue_redraw();
	return still_selected;
}
List<CanvasItem *> CanvasItemEditor::_get_edited_canvas_items(bool retrieve_locked, bool remove_canvas_item_if_parent_in_selection) {