Convert to Group Nodes is not working.

### Custom Node Testing

- [x] I have tried disabling custom nodes and the issue persists (see [how to disable custom nodes](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled) if you need help)

### Expected Behavior

The ability to Group Nodes into 1 node, by selecting more than one node, then in the RMB menu, select Convert to Group Nodes

### Actual Behavior

I have some group nodes, but in this release they don't work properly, with the error:

`Failed to get input node 1 for group node child 151:2 with slot `

If I RMB on the group node, and then select "Convert to Nodes", the workflow then works. But I am unable to regroup the nodes.

### Steps to Reproduce

- Open a new workflow
- Add and chain together 2 or 3 nodes
- Select all the nodes
- RMB (right Mouse Button) on the selected nodes

NOTE: Menu Item for Converting to Group Node is missing.

- Open existing workflow that contains Group nodes
- Run Workflow
- Note error
- RMB on Node

NOTE: Menu item for Converting Group nodes is present, but you are unable to create a group node, you can only convert back to Nodes.

### Debug Logs

There is no output. But an onscreen popup that states:

```powershell
`Failed to get input node 1 for group node child 151:2 with slot `
```

### Other

Python version: 3.12.0 (tags/v3.12.0:0fb18b0, Oct 2 2023, 13:03:39) [MSC v.1935 64 bit (AMD64)]
ComfyUI version: 0.3.44
ComfyUI frontend version: 1.24.1