Debugging a single unit test in VS Code on Windows

I have been having trouble with debugging unit tests inside VS code. I am able to launch the debugging session and step through the code, but unable to view the contents of most variables, such as the contents of a Vec. Many variables in the debug pane are listed as "Optimized away" and "not available".

The resources I've found online are for debugging a binary application, not a single unit test through the VS code UI.

Does anyone know how to make the experience better?