C# and VB CodeLens windows show "Unknown" instead of the text of the reference

_This issue has been moved from [a ticket on Developer Community](https://developercommunity.visualstudio.com/t/C-and-VB-CodeLens-windows-show-Unknown/10977034)._

---
1. Add this code to a C# project.

```
int func1() => 1;
int func2() => func1() * 2;
```

Click the 1 reference code lens and then click the icon in the top right to open the Code Lens windows.

Bug: The title bar says "Unknown" which seems like a bug (which doesn't repro with C++ Code Lens). I think it's supposed to show "func1".

C#: incorrect

C++: correct

---
### Original Comments

#### Feedback Bot on 10/5/2025, 08:11 PM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

Reproduce the issue in a C# project using the two functions shown, then open the func1 reference CodeLens window and compare its title with the C++ behavior described. Trace the CodeLens window's title source and determine why it becomes "Unknown" instead of showing func1; done means the C# and VB title displays the referenced symbol text.

Written by the indexing model from the issue text.