Run/Debug links disappear if I add a record to my test code

Example repo: https://github.com/peeveen/VSCodeDebugBug

I have created a simple dummy class library, and MSTest test project.
Here's my test class:


As you can see, Run/Debug links are appearing fine.
If I add a `record` to this code:


... they disappear.
It also happens if I add an empty inner class:


If I add any properties/functions to this class, the links re-appear.