The Run/Debug button has disappeared in .csproj projects with the C# Dev Kit active.

[Jomontalvo]

Describe the Issue

After using GitHub Copilot with an agent to run unit tests on an .slnx solution, the Run/Debug button (the Play icon) simply disappeared. When I open the Program.cs file, it doesn't appear, and the text options do nothing when I have a solution without a unit test project. However, when a unit test project exists, it's the one that runs from these options, even with the Program.cs file open.

Steps To Reproduce

1. Create an SLNx solution and API project (.csproj).
2. Open the Program.cs file.

Expected Behavior

The Run/Debug button (icon) should be visible, but it is not.

Environment Information

Os: MacOS 26.5.1
VS Code: 1.122.1
Extensions:
C# Dev Kit: 3.20.199
C#: 2.142.16
NET Install Tool: 3.0.2

[claudiaregio]

@vsccarl are you seeing this on the latest version of stable and latest pre-release build?

@Jomontalvo Thanks for reporting, was the run button there before you tried using GHCP to run the tests? Does a reload bring the button back?

[vsccarl]

@claudiaregio I'm not able to repro on any combination of C#/CDK stable/prerelease, Code stable/insiders. I tried various projects/solutions/no solutions.

[Jomontalvo]

Hi @claudiaregio, Yes, the button was there and I used it frequently, but it disappeared, and reloading the page didn't bring it back. I tried removing and re-install C# Dev Kit / C# / .NET Install Tool extensions, but without success. Additional information: In the solution where I don't have an MSTest project, enabling the C# Dev Kit - Test Explorer output; and click on the options that now appear:

• Run project associated with this file
• Debug project associated with this file
  A new line appears at the end each time:
  2026-06-02 03:46:44.628 [info] Created Test Controller (Lightweight Test Experience)
  2026-06-02 03:46:44.628 [info] Log verbosity: Info
  2026-06-02 03:46:44.628 [info] C# Dev Kit version: 3.20.199
  2026-06-02 03:46:45.971 [info] Initialized Test Explorer Server [70474]
  2026-06-02 03:46:45.978 [info] The dotnet SDK was found in /usr/local/share/dotnet/sdk/10.0.300.
  2026-06-02 03:46:46.039 [info] Initializing 1 project(s) from cache.
  2026-06-02 03:47:03.549 [warning] No test projects to run.
  2026-06-02 03:48:34.474 [warning] No test projects to run.
  =====
  Is there a configuration that mandates running a default test project? Is it possible that some settings was changed during the agent's interaction with GHCP?
  Thanks!

[Jomontalvo]

Hi @claudiaregio, @vsccarl:
I was able to make the Run/Debug button appear using the View: Reset All Menus option in Settings > Command Palette. Now the problem is different, and perhaps my previous comment highlighted it. When I click the Run or Debug button, it only searches for a unit test project to run; so even if I have the Editor open with Program.cs, it will always search for (or run) the unit test project. Is there some setting that might have been changed in the functionality of this button in the Tab Bar (Editor Actions)?