Primitive node in Subgraph: potential bug

### 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

I create 2 "Primitive" nodes and connect them to "width" and "height" of "Empty Latent Image" node. Then I select those 2 "Primitive" nodes and convert them to Subgraph. When I go inside the Subgraph with those 2 "Primitive" nodes

I still can adjust them from inside of it

### Actual Behavior

I create 2 "Primitive" nodes and connect them to "width" and "height" of "Empty Latent Image" node. Then I select those 2 "Primitive" nodes and convert them to Subgraph. When I go inside the Subgraph with those 2 "Primitive" nodes

I'm not able to adjust them because they look like they doesn't connected to anything at all

### Steps to Reproduce

**Step 1:**

**Step 2:**

**That's how they look inside of Subgraph ↓**

### Debug Logs

```powershell
-
```

### Other

Not sure if this behavior is intentional or it's a bug

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-8257-Primitive-node-in-Subgraph-potential-bug-2f16d73d3650818cbd64df71678b7eb5) by [Unito](https://www.unito.io)