Copy and Paste bugs return 1.42.11

### Prerequisites

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

### What happened?

environment: ComfyUI 0.19.1, FE 1.42.11, Firefox, venv running in Ubuntu>

Copy and paste buys return with this version. Again, downgraded to 1.39.19 which has its quirks but is about OK.

When copying a group of nodes, the are not pasted at mouse like normal. One or more get's pasted 'miles' away on the canvas- a distance about 4 times the size of a typical workflow.

Annoying, but more annoying undo (xtrl-z) doesn't undo this faulty paste. It undoes one of the nodes pasted. So if I copy 12 nodes, I have to press undo 12 times, carefully watching what it is undoing... a challenge if the pasted notes are 'miles' away.

Copy and paste bugs come and go with releases and happen arbitrarily (like the old 'pasting a completely different node to that copied problem').

Together with persistent missing model messages that can't be disable, workflow template faults, etc I am currently still downgrading releases of ComfyUI to use 1.39.19.

### Steps to Reproduce

1.Copy and paste some nodes on a sizeable workflow.
2.
3.

### How is this affecting you?

Feature doesn't work as expected

### ComfyUI Frontend Version

1.42.11

### Browser

Firefox

### Console Errors

```javascript

```

### Logs

```shell

```

### Additional Context

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-11304-Copy-and-Paste-bugs-return-1-42-11-3446d73d3650817cbed1d26c639c5814) by [Unito](https://www.unito.io)

No source file or test is named. First reproduce the copy-and-paste and undo behavior in Firefox with ComfyUI Frontend 1.42.11 on a sizeable workflow, then trace the frontend handlers involved; done means pasted nodes stay near the pointer and one undo removes the whole paste operation.

Written by the indexing model from the issue text.