gherkin/specflow test discovery

I'm wondering what configuration is required in order to discover specflow/BDD/gherkin tests?

i'm able to set up a project with some basic specflow tests by following - https://testautomation.org/setting-up-specflow-on-a-dotnet-core-project-using-visual-studio-code-with-linux-os/

I can run the tests with `dotnet test` but they are not discovered by this extension.

The configured glob pattern *does* match the `*.csproj` file in the project root.