Node 'ID #98:17' has no class_type. The workflow may be corrupted or a custom node is missing.

### 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

Node 'ID #98:17' has no class_type. The workflow may be corrupted or a custom node is missing.

### Actual Behavior

Node 'ID #98:17' has no class_type. The workflow may be corrupted or a custom node is missing.

### Steps to Reproduce

Node 'ID #98:17' has no class_type. The workflow may be corrupted or a custom node is missing.

### Debug Logs

```powershell
Node 'ID #98:17' has no class_type. The workflow may be corrupted or a custom node is missing.
```

### Other

_No response_

No source file, test, workflow JSON, or reproducible steps are provided. First obtain the affected workflow and complete reproduction details, then locate the validation path that emits the class_type message; done means determining whether the workflow is corrupted or a missing custom node causes the failure.

Written by the indexing model from the issue text.