Groups and Links disapeared

### 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 group boxes and the links between nodes disappeared. I can't get them back :(

### Steps to Reproduce

1. Unable to reproduce as i am unable to get the Groups and Links back

### How is this affecting you?

Visual/UI issue only

### ComfyUI Frontend Version

1.3.70

### Browser

Firefox

### Console Errors

```javascript

```

### Logs

```shell

```

### Additional Context

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-6751-Groups-and-Links-disapeared-2b06d73d3650818a8a65fdc8b9094817) by [Unito](https://www.unito.io)

Start by checking the issue in ComfyUI frontend 1.3.70 using Firefox with custom nodes disabled, following the available report steps and comparing the attached screenshots. There is no reproducible sequence, named file, test, or entry point in the report; done means the group boxes and links between nodes are visible again.

Written by the indexing model from the issue text.