### 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
break;
				case TOOL_PAN:
					c = CURSOR_DRAG;
					break;
				case TOOL_RULER:
					c = CURSOR_CROSS;
					break;
				default:
					break;
			}
			break;
		case DRAG_LEFT:
		case DRAG_RIGHT:
			c = rotation_array[rotation_array_index];
			break;
		case DRAG_V_GUIDE:
			c = CURSOR_HSIZE;
			break;
		case DRAG_TOP:
		case DRAG_BOTTOM:
			c = rotation_array[(rotation_array_index + 2) % 4];
			break;
		case DRAG_H_GUIDE:
			c = CURSOR_VSIZE;
			break;
		case DRAG_TOP_LEFT:
		case DRAG_BOTTOM_RIGHT:
			c = rotation_array[(rotation_array_index + 3) % 4];
			break;
		case DRAG_DOUBLE_GUIDE: