### 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;
					}
				}
			}
			
			if (b.is_valid() && b->get_button_index() == MouseButton::LEFT && b->is_pressed()) {
				
				if (b->get_position().x < RULER_WIDTH && b->get_position().y < RULER_WIDTH) {
					
					drag_type = DRAG_DOUBLE_GUIDE;
					dragged_guide_index = -1;
					return true;
				} else if (b->get_position().x < RULER_WIDTH) {
					
					dragged_guide_index = -1;
					for (int i = 0; i < hguides.size(); i++) {
						if (ABS(xform.xform(Point2(0, hguides[i])).y - b->get_position().y) < MIN(minimum, 8)) {
							dragged_guide_index = i;
						}
					}
					if (dragged_guide_index >= 0) {
						
						drag_type = DRAG_H_GUIDE;
					} else {
						
						drag_type = DRAG_V_GUIDE;
					}
					return true;
				} else if (b->get_position().y < RULER_WIDTH) {