### 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
#include "canvas_item_editor_plugin.h"
#include "core/config/project_settings.h"
#include "core/input/input.h"
#include "core/os/keyboard.h"
#include "editor/debugger/editor_debugger_node.h"
#include "editor/editor_node.h"
#include "editor/editor_scale.h"
#include "editor/editor_settings.h"
#include "editor/editor_toaster.h"
#include "editor/editor_undo_redo_manager.h"
#include "editor/editor_zoom_widget.h"
#include "editor/plugins/animation_player_editor_plugin.h"
#include "editor/plugins/script_editor_plugin.h"
#include "editor/scene_tree_dock.h"
#include "scene/2d/cpu_particles_2d.h"
#include "scene/2d/gpu_particles_2d.h"
#include "scene/2d/light_2d.h"
#include "scene/2d/polygon_2d.h"
#include "scene/2d/skeleton_2d.h"