Tests are not discovered in VS when the NUnit version is 3.11 or less

[jnm2]

Affected adapter versions that I tested were 4.5.0, 4.6.0, and 5.0.0. When running tests such as this repro project, tests are not discovered during runs initiated inside Visual Studio, but they are during dotnet test runs.

When running tests in Test Explorer, which has this problem, the Output window for Tests shows NUnit3TestExecutor discovered 0 of 8 NUnit tests cases using Current Discovery mode, Explicit run.

When running dotnet test, which does not have this problem, the console shows NUnit3TestExecutor discovered 8 of 8 NUnit test cases using Current Discovery mode, Non-Explicit run.

The word 'explicit' does not appear in the repro. Any empty test will demonstrate this issue.

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
    <PackageReference Include="NUnit" Version="3.11.0" />
    <PackageReference Include="NUnit3TestAdapter" Version="5.0.0" />
  </ItemGroup>

</Project>

[OsirisTerje]

I can repro this https://github.com/nunit/nunit3-vs-adapter.issues/tree/master/Issue1264

Strange.....