https://specflow.org/2019/changes-to-the-specflow-visual-studio-extension/
How to start debug now in VS2015?
https://specflow.org/2019/changes-to-the-specflow-visual-studio-extension/
How to start debug now in VS2015?
When compiling scripts, SpecFlow generates unit tests. You need to debug them. The breakpoints on the script file will work.
You can use the Test Explorer integrated in Visual Studio (https://learn.microsoft.com/en-us/visualstudio/test/run-unit-tests-with-test-explorer?view=vs-2019)