ITestRunner.Run() does not pass Activity.Current to underlying test

[DanielVuurboom]

We're calling specific tests programmatically through ITestRunner.Run(). In older versions of NUnit.Engine, the Activity.Current that was started before the Run() call was available in the test, and we use this to pass some data (a TraceId, to be specific).
In the current version, Activity.Current is set to null inside the test, which breaks our implementations.

Please see the attached zip file for a small C# project demonstrating the current, unexpected, behavior:
ActivityDebugging.zip

Replacing the packages with these older versions shows the Activity.Current set as expected:

    <PackageReference Include="NUnit.Engine" Version="3.15.2" />
    <PackageReference Include="NUnit.Engine.Api" Version="3.15.2" />
    <PackageReference Include="NUnit" Version="3.13.3" />

[CharliePoole]

What happens if you use the 3.19 engine and api but vary the version of NUnit?

[DanielVuurboom]

    <PackageReference Include="NUnit.Engine" Version="3.19.0" />
    <PackageReference Include="NUnit.Engine.Api" Version="3.19.0" />
    <PackageReference Include="NUnit" Version="3.13.3" />

results in a null Activity.Current, just like

    <PackageReference Include="NUnit.Engine" Version="3.19.0" />
    <PackageReference Include="NUnit.Engine.Api" Version="3.19.0" />
    <PackageReference Include="NUnit" Version="4.3.2" />