Nodes 2.0 also break rgthree's nested subdirectories in menus

### Prerequisites

- [x] I am running the latest version of ComfyUI
- [x] I have searched existing issues to make sure this isn't a duplicate
- [x] I have tested with all custom nodes disabled ([see how](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled))

### What happened?

The Nodes 2.0 feature break rgthree's subdirectories menu nesting. Don't forget that this feature also applies to any selector as long as it features "/" in its name, like this ComfyUI Styler node that I have expanded into categories using AI. Nodes 2.0 returns them to the old-fashion endless list.

### Steps to Reproduce

1. Intall rgthree's extension
2. Enable menu subdir nesting
3. Browse a menu that would be nested by the plugin.

### How is this affecting you?

Crashes ComfyUI completely

### ComfyUI Frontend Version

1.34.9

### Browser

Chrome/Chromium

### Console Errors

```javascript

```

### Logs

```shell

```

### Additional Context

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-7595-Nodes-2-0-also-break-rgthree-s-nested-subdirectories-in-menus-2cc6d73d365081939810d6716513ff58) by [Unito](https://www.unito.io)