### 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_type = DRAG_PIVOT;
			}
			return true;
		}
	}
	if (drag_type == DRAG_PIVOT) {
		
		if (m.is_valid()) {
			drag_to = transform.affine_inverse().xform(m->get_position());
			_restore_canvas_item_state(drag_selection);
			Vector2 new_pos;
			if (drag_selection.size() == 1) {
				new_pos = snap_point(drag_to, SNAP_NODE_SIDES | SNAP_NODE_CENTER | SNAP_NODE_ANCHORS | SNAP_OTHER_NODES | SNAP_GRID | SNAP_PIXEL, 0, drag_selection[0]);
			} else {
				new_pos = snap_point(drag_to, SNAP_OTHER_NODES | SNAP_GRID | SNAP_PIXEL);
			}
			for (CanvasItem *ci : drag_selection) {
				ci->_edit_set_pivot(ci->get_global_transform_with_canvas().affine_inverse().xform(new_pos));
			}
			return true;
		}
		
		if (drag_selection.size() >= 1 &&
				((b.is_valid() && !b->is_pressed() && b->get_button_index() == MouseButton::LEFT && tool == TOOL_EDIT_PIVOT) ||
						(k.is_valid() && !k->is_pressed() && k->get_keycode() == Key::V))) {
			_commit_canvas_item_state(
					drag_selection,
					vformat(
							TTR("Set CanvasItem \"%s\" Pivot Offset to (%d, %d)"),
							drag_selection[0]->get_name(),