In VSCode 1.20 and 1.21 does not allow you to hit breakpoints. VSCode 1.18 works fine

In VSCode 1.20 and 1.21 does not allow you to hit breakpoints. VSCode 1.18 works fine

If you are using VSCode 1.21 set the outFiles parameter in your launch config

Workaround - Try Deactivate then reactive breakpoints after debugging has started, Or, right click the breakpoints pane and "Reapply all breakpoints".