Subgraph Promoted widgets showing as Disconnected after upgrading ComfyUI

### Custom Node Testing

- [ ] 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

For subgraph promoted widgets to appear and not show as Disconnected.

### Actual Behavior

The promoted widget shows as Disconnected.

### Steps to Reproduce

After upgrading comfy to 0.17.0 / 1.41.20 existing workflow Subgraphs showing some widgets as Disconnected. This looks to be for Subgraphs with other Subgraph within them, when trying to promote a widget from the sub-Subgraph to the top Subgraph. This was working fine prior to 0.17.0.

Starting with a new workflow I make a Subgraph with a promoted primitive (level1_value) and another Subgraph that has a promoted primitive (level2_value). Promote the level2_value widget on the sub-Subgraph to the top Subgraph.

The promoted Widget of the nested Subgraph shows as Disconnected.

### Debug Logs

```powershell
N/A
```

### Other

_No response_

Start by reproducing the issue in ComfyUI 0.17.0 / 1.41.20 with nested Subgraphs and promoted primitives, following the steps in the report. Compare the behavior with a pre-upgrade version and trace how the level2_value widget is promoted to the top Subgraph. Done means the nested promoted widget appears connected rather than Disconnected.

Written by the indexing model from the issue text.