Nevigate returns false, Not working

[CycloneRing]

Hi, I am making a very basic app using wpfui, I use .net framework 4.6.2 and I do not use IHost
My issue is when I use RootNavigation.Navigate() it returns false, However when assining same page by INavigateItem by clicking on it page shows up.

Here is a minimal code : https://github.com/CycloneRing/WpfUI_Study

And here is the function not working.
https://github.com/CycloneRing/WpfUI_Study/blob/acde6b82e7c1efc49e26fdc6885a1a57bc2de3ce/Dashboard.xaml.cs#L61

Can anyone guide me how to fix it?

@pomianowski I appreciate if you take a look. MVVM is too complex for my usecase I just need a simple setup.