### Godot version

4.0 fb10f45

### System information

Windows 10 x64

### Issue description

Behold, empty TileSet editor, with no TileMap node nor bottom button visible:
![image](https://github.com/godotengine/godot/assets/2223172/0f052770-4946-40eb-a790-a995dbe2599c)
Regression from #72277 (most likely, I didn't test)

### Steps to reproduce

1. Add some Node to your scene
2. Add a TileMap as a child
3. Select TileMap
4. Fold its parent in the scene tree
5. Restart the editor
6. The TileMap selection is restored and so is the folded node, resulting in a weird paradox

### Minimal reproduction project

N/A
ERR_FAIL_COND_V_MSG(p_class.is_empty(), nullptr, "Class name cannot be empty.");
	EditorData &ed = EditorNode::get_editor_data();
	
	if (p_script.is_valid()) {
		Ref<Texture2D> script_icon = ed.get_script_icon(p_script);
		if (script_icon.is_valid()) {
			return script_icon;
		}
		
		
		String base_type;
		p_script->get_language()->get_global_class_name(p_script->get_path(), &base_type);
		
		Ref<Texture2D> ext_icon = ed.extension_class_get_icon(base_type);
		if (ext_icon.is_valid()) {
			return ext_icon;
		}
		
		
		if (gui_base && gui_base->has_theme_icon(base_type, "EditorIcons")) {
			return gui_base->get_theme_icon(base_type, "EditorIcons");
		}
	}
	
	
	
	Ref<Texture2D> ext_icon = ed.extension_class_get_icon(p_class);