In the subgraph, some node widgets cannot be promoted

### Expected Behavior

I expect that in the subgraph, the widgets of these nodes can be promoted.

Start by reproducing the reported behavior in a subgraph using the attached screenshot as the reference, then trace the node-widget promotion flow. Confirm which widgets fail to promote and compare them with widgets that do work. Done means the affected node widgets can be promoted inside the subgraph.

Written by the indexing model from the issue text.