"<unknown>" in breadcrumb for private constructor

I fixed some of these recently, but this one still seems broken?

<img width="769" height="364" alt="Image" src="https://github.com/user-attachments/assets/bedb076b-0657-43db-9978-762c0a1a98b2" />

```dart
class FactoryWithoutType {
  FactoryWithoutType._();
  factory() => FactoryWithoutType._();
  factory named() => FactoryWithoutType._();
```