### 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
EditorNode::get_singleton()->edit_resource(p_resource);
}
void ThemeTypeEditor::_font_item_changed(Ref<Font> p_value, String p_item_name) {
	EditorUndoRedoManager *ur = EditorUndoRedoManager::get_singleton();
	ur->create_action(TTR("Set Font Item in Theme"));
	ur->add_do_method(*edited_theme, "set_font", p_item_name, edited_type, p_value.is_valid() ? p_value : Ref<Font>());
	if (edited_theme->has_font(p_item_name, edited_type)) {
		ur->add_undo_method(*edited_theme, "set_font", p_item_name, edited_type, edited_theme->get_font(p_item_name, edited_type));
	} else {
		ur->add_undo_method(*edited_theme, "set_font", p_item_name, edited_type, Ref<Font>());
	}
	ur->add_do_method(this, "call_deferred", "_update_type_items");
	ur->add_undo_method(this, "call_deferred", "_update_type_items");
	ur->commit_action();
}
void ThemeTypeEditor::_icon_item_changed(Ref<Texture2D> p_value, String p_item_name) {
	EditorUndoRedoManager *ur = EditorUndoRedoManager::get_singleton();
	ur->create_action(TTR("Set Icon Item in Theme"));
	ur->add_do_method(*edited_theme, "set_icon", p_item_name, edited_type, p_value.is_valid() ? p_value : Ref<Texture2D>());
	if (edited_theme->has_icon(p_item_name, edited_type)) {
		ur->add_undo_method(*edited_theme, "set_icon", p_item_name, edited_type, edited_theme->get_icon(p_item_name, edited_type));
	} else {
		ur->add_undo_method(*edited_theme, "set_icon", p_item_name, edited_type, Ref<Texture2D>());
	}
	ur->add_do_method(this, "call_deferred", "_update_type_items");
	ur->add_undo_method(this, "call_deferred", "_update_type_items");
	ur->commit_action();
}
void ThemeTypeEditor::_stylebox_item_changed(Ref<StyleBox> p_value, String p_item_name) {