Cannot copy/paste groups of nodes anymore when using frontend_latest.

### Prerequisites

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

### What happened?

These two problems were fixed two months ago, they seem to be back:
I am running --front-end-version Comfy-Org/ComfyUI_frontend@latest . when running the latest frontend,
Copy/Paste of nodes does not work anymore. I want to copy one node group from a workflow to another workflow, it does not work anymore. i copy the group, and when i want to paste it, another node i had copied serveral hours ago is pasted, or no node is pasted at all.
I thought i could come from my system. so i restarted comfyui disabling the latest frontend. and... yes pasting works.
I did this a couple of times with different installations of comfy ui. And it is clear:
When using --front-end-version Comfy-Org/ComfyUI_frontend@latest you cannot copy paste nodes.

I remember this same thing happening a couple of months ago, and after several people reporting it was finally fixed.

There is a second thing happening, but Imho they are related. If you use the rgthree groups muter with --front-end-version Comfy-Org/ComfyUI_frontend@latest, then the setting "only one", the setting most people use, does not work. I think it has to do with the issue that results in not being able to copy and paste, so I think that has priority.

### Steps to Reproduce

1.Try an copy a group of more than 5 nodes when you are using --front-end-version Comfy-Org/ComfyUI_frontend@latest.
2.then try and paste that group in another workflow.
3.It will not work.
4. if you switch to normal frontend, it works again.
5. use the latest again it will not work.

### Workflow

N/A
it will happen with any workflow, as long as there is a group with more than 3 nodes.
[edit]mistake, not group with more than 3 nodes.. thats wrong.. just tested.. doesnt even work with 1 node.

### How is this affecting you?

Feature doesn't work as expected

### ComfyUI Frontend Version

1.54.6

### Browser

Chrome/Chromium

### Console Errors

```javascript

```

### Logs

```shell

```

### Additional Context

the only workaround is using the "standard" front end

Start by reproducing the copy/paste failure in ComfyUI_frontend@latest 1.54.6 using Chrome/Chromium, then compare it with the standard frontend and a one-node workflow. Verify whether copying and pasting nodes between workflows works consistently, and check whether the rgthree groups muter "only one" setting is also affected. Done means the latest frontend reliably pastes the selected nodes without restoring stale clipboard contents.

Written by the indexing model from the issue text.