### 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
_update_add_type_options(p_value);
}
void ThemeTypeDialog::_add_type_options_cbk(int p_index) {
	add_type_filter->set_text(add_type_options->get_item_text(p_index));
}
void ThemeTypeDialog::_add_type_dialog_entered(const String &p_value) {
	_add_type_selected(p_value.strip_edges());
}
void ThemeTypeDialog::_add_type_dialog_activated(int p_index) {
	_add_type_selected(add_type_options->get_item_text(p_index));
}
void ThemeTypeDialog::_add_type_selected(const String &p_type_name) {
	pre_submitted_value = p_type_name;
	if (p_type_name.is_empty()) {
		add_type_confirmation->popup_centered();
		return;
	}
	_add_type_confirmed();
}
void ThemeTypeDialog::_add_type_confirmed() {