### 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
drag_selection[0]->_edit_get_position().y),
							true);
				}
			}
			if (key_auto_insert_button->is_pressed()) {
				_insert_animation_keys(true, false, false, true);
			}
			
			snap_target[0] = SNAP_TARGET_NONE;
			snap_target[1] = SNAP_TARGET_NONE;
			_reset_drag();
			viewport->queue_redraw();
			return true;
		}
		
		if (b.is_valid() && b->get_button_index() == MouseButton::RIGHT && b->is_pressed()) {
			_restore_canvas_item_state(drag_selection, true);
			snap_target[0] = SNAP_TARGET_NONE;
			snap_target[1] = SNAP_TARGET_NONE;
			_reset_drag();
			viewport->queue_redraw();
			return true;
		}
	}
	
	if (k.is_valid() && k->is_pressed() && (tool == TOOL_SELECT || tool == TOOL_MOVE) &&
			(k->get_keycode() == Key::UP || k->get_keycode() == Key::DOWN || k->get_keycode() == Key::LEFT || k->get_keycode() == Key::RIGHT)) {
		if (!k->is_echo()) {
			
			List<CanvasItem *> selection = _get_edited_canvas_items();