How to extend functions in GameMode class?

I’m not sure how to use breakpoints. I’ve added it in VS and started instance in Debug Game Editor but nothing happens. I’ve also added UELOG but theres is no this message in Output. My GameMode is set correctly.
So I understand that I didn’t missed something obvious and all what I should do to extend function is that what I’ve made?

EDIT: Maybe RestartPlayer function isn’t triggered anyway but generaly my problem is why compiler can’t find reference from parent function?