### 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
} else {
		select_fonts_label->set_text(TTR("No fonts found."));
		select_all_fonts_button->set_visible(false);
		select_full_fonts_button->set_visible(false);
		deselect_all_fonts_button->set_visible(false);
	}
	if (font_size_amount > 0) {
		Array arr;
		arr.push_back(font_size_amount);
		select_font_sizes_label->set_text(TTRN("1 font size", "{num} font sizes", font_size_amount).format(arr, "{num}"));
		select_all_font_sizes_button->set_visible(true);
		select_full_font_sizes_button->set_visible(true);
		deselect_all_font_sizes_button->set_visible(true);
	} else {
		select_font_sizes_label->set_text(TTR("No font sizes found."));
		select_all_font_sizes_button->set_visible(false);
		select_full_font_sizes_button->set_visible(false);
		deselect_all_font_sizes_button->set_visible(false);
	}
	if (icon_amount > 0) {
		Array arr;
		arr.push_back(icon_amount);
		select_icons_label->set_text(TTRN("1 icon", "{num} icons", icon_amount).format(arr, "{num}"));
		select_all_icons_button->set_visible(true);
		select_full_icons_button->set_visible(true);
		deselect_all_icons_button->set_visible(true);
		select_icons_warning_hb->set_visible(true);
	} else {
		select_icons_label->set_text(TTR("No icons found."));
		select_all_icons_button->set_visible(false);