### 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
select_items_label = select_colors_label;
				deselect_all_items_button = deselect_all_colors_button;
				select_all_items_button = select_all_colors_button;
				select_full_items_button = select_full_colors_button;
				total_selected_items_label = total_selected_colors_label;
				items_title = TTR("Colors");
				select_all_items_tooltip = TTR("Select all visible color items.");
				select_full_items_tooltip = TTR("Select all visible color items and their data.");
				deselect_all_items_tooltip = TTR("Deselect all visible color items.");
				break;
			case Theme::DATA_TYPE_CONSTANT:
				select_items_icon = select_constants_icon;
				select_items_label = select_constants_label;
				deselect_all_items_button = deselect_all_constants_button;
				select_all_items_button = select_all_constants_button;
				select_full_items_button = select_full_constants_button;
				total_selected_items_label = total_selected_constants_label;
				items_title = TTR("Constants");
				select_all_items_tooltip = TTR("Select all visible constant items.");
				select_full_items_tooltip = TTR("Select all visible constant items and their data.");
				deselect_all_items_tooltip = TTR("Deselect all visible constant items.");
				break;
			case Theme::DATA_TYPE_FONT:
				select_items_icon = select_fonts_icon;
				select_items_label = select_fonts_label;
				deselect_all_items_button = deselect_all_fonts_button;
				select_all_items_button = select_all_fonts_button;
				select_full_items_button = select_full_fonts_button;
				total_selected_items_label = total_selected_fonts_label;
				items_title = TTR("Fonts");