### 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
}
				Bone2D *bone = Object::cast_to<Bone2D>(b);
				if (bone && bone->get_length() != E.value.length) {
					E.value.length = bone->get_length();
					viewport->queue_redraw();
				}
			}
		} break;
		case NOTIFICATION_ENTER_TREE: {
			select_sb->set_texture(get_theme_icon(SNAME("EditorRect2D"), SNAME("EditorIcons")));
			select_sb->set_texture_margin_all(4);
			select_sb->set_content_margin_all(4);
			AnimationPlayerEditor::get_singleton()->get_track_editor()->connect("visibility_changed", callable_mp(this, &CanvasItemEditor::_keying_changed));
			_keying_changed();
			_update_editor_settings();
		} break;
		case EditorSettings::NOTIFICATION_EDITOR_SETTINGS_CHANGED: {
			select_sb->set_texture(get_theme_icon(SNAME("EditorRect2D"), SNAME("EditorIcons")));
			_update_editor_settings();
		} break;
		case NOTIFICATION_VISIBILITY_CHANGED: {
			if (!is_visible() && override_camera_button->is_pressed()) {
				EditorDebuggerNode *debugger = EditorDebuggerNode::get_singleton();
				debugger->set_camera_override(EditorDebuggerNode::OVERRIDE_NONE);
				override_camera_button->set_pressed(false);
			}
		} break;
	}
}
void CanvasItemEditor::_selection_changed() {