### 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
emit_signal(SNAME("type_selected"), pre_submitted_value);
	hide();
}
void ThemeTypeDialog::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE: {
			connect("about_to_popup", callable_mp(this, &ThemeTypeDialog::_dialog_about_to_show));
			[[fallthrough]];
		}
		case NOTIFICATION_THEME_CHANGED: {
			_update_add_type_options();
		} break;
		case NOTIFICATION_VISIBILITY_CHANGED: {
			if (is_visible()) {
				add_type_filter->grab_focus();
			}
		} break;
	}
}
void ThemeTypeDialog::_bind_methods() {
	ADD_SIGNAL(MethodInfo("type_selected", PropertyInfo(Variant::STRING, "type_name")));
}
void ThemeTypeDialog::set_edited_theme(const Ref<Theme> &p_theme) {
	edited_theme = p_theme;
}
void ThemeTypeDialog::set_include_own_types(bool p_enable) {