Debug stencil app starter kit not working

Even after putting a breakpoint and hit debug mode, when you hover over the breakpoint it says "Breakpoint ignored because generated code not found (source map problem?)."

I am using https://github.com/ionic-team/stencil-app-starter.

I don’t see any tsx map files created when I build the app.
Does the app starter kit has a configuration issue for creating those source maps? Or am I missing something?