### Godot version

v4.2.beta2.official [f8818f85e]

### System information

Windows 10, 64bit

### Issue description

Some times can't add node in visualshader editor

### Steps to reproduce

1. Open a VisualShader file for edit.
2. Click the `Add Node...` button, it will popup menu, it is OK.
3. Direct close the menu.
4. Clikd the `Add Node...` again, the menu can't popup.
![GIF](https://github.com/godotengine/godot/assets/35988767/1326c63e-3e05-4423-9ec7-7ce305b3f4f5)

### Minimal reproduction project

/
if (p_script.is_null() || p_script->get_instance_base_type() != "VisualShaderNodeCustom") {
		return;
	}
	Ref<VisualShaderNodeCustom> ref;
	ref.instantiate();
	ref->set_script(p_script);
	Dictionary dict = get_custom_node_data(ref);
	add_custom_type(dict["name"], String(), dict["script"], dict["description"], dict["return_icon_type"], dict["category"], dict["highend"]);
	_update_options_menu();
}
void VisualShaderEditor::_update_custom_script(const Ref<Script> &p_script) {