All our workflows are broken

### Prerequisites

- [x] I am running the latest version of ComfyUI
- [x] I have custom nodes enabled

### What happened?

After updating Comfy all of our studio worklfows got broken, the subgraphs are not working and we are getting a constant red error "Failed to save workflow draft". We are forced to never update comfy until this is solved, our studio workflow has hundreds of nodes and took weeks to build. At the moment we ha solved it reverting to an older frontend version.

### Steps to Reproduce

open an older workflow with nested and subnested subgraphs with various type of inputs, boolean, float, sliders, all say "disconnected".

### How is this affecting you?

Crashes ComfyUI completely

### ComfyUI Frontend Version

0.18.2

### Browser

Firefox

### Console Errors

```javascript

```

### Logs

```shell

```

### Additional Context

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-10772-All-our-workflows-are-broken-3346d73d3650816c8342d5be37d85b95) by [Unito](https://www.unito.io)