Lots of null-warnings

[NidusUmbra]

Describe the bug

I'm seeing a lot of 'dereference of possibly null reference', ' must have a value when exiting constructor' etc after creating a new project from template.

! Warning CS8625 Cannot convert null literal to non-nullable reference type. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Contracts\Services\INavigationService.cs 13 Active
Warning CS8625 Cannot convert null literal to non-nullable reference type. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\NavigationService.cs 52 Active
Warning CS8603 Possible null reference return. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\App.xaml.cs 30 Active
Warning CS8618 Non-nullable field '_host' must contain a non-null value when exiting constructor. Consider declaring the field as nullable. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\App.xaml.cs 32 Active
Warning CS8602 Dereference of a possibly null reference. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\App.xaml.cs 38 Active
Warning CS8625 Cannot convert null literal to non-nullable reference type. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\App.xaml.cs 85 Active
Warning CS8603 Possible null reference return. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Helpers\FrameExtensions.cs 12 Active
Warning CS8618 Non-nullable property 'PrivacyStatement' must contain a non-null value when exiting constructor. Consider declaring the property as nullable. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Models\AppConfig.cs 5 Active
Warning CS8618 Non-nullable field '_shellWindow' must contain a non-null value when exiting constructor. Consider declaring the field as nullable. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\ApplicationHostService.cs 18 Active
Warning CS8601 Possible null reference assignment. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\ApplicationHostService.cs 72 Active
Warning CS8602 Dereference of a possibly null reference. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\ApplicationHostService.cs 73 Active
Warning CS8604 Possible null reference argument for parameter 'pageKey' in 'bool INavigationService.NavigateTo(string pageKey, object parameter = null, bool clearNavigation = false)'. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\ApplicationHostService.cs 75 Active
Warning CS8618 Non-nullable field '_frame' must contain a non-null value when exiting constructor. Consider declaring the field as nullable. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\NavigationService.cs 19 Active
Warning CS8618 Non-nullable field '_lastParameterUsed' must contain a non-null value when exiting constructor. Consider declaring the field as nullable. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\NavigationService.cs 19 Active
Warning CS8618 Non-nullable event 'Navigated' must contain a non-null value when exiting constructor. Consider declaring the event as nullable. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\NavigationService.cs 19 Active
Warning CS8625 Cannot convert null literal to non-nullable reference type. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\NavigationService.cs 36 Active
Warning CS8604 Possible null reference argument for parameter 'e' in 'void EventHandler.Invoke(object? sender, string e)'. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\NavigationService.cs 96 Active
Warning IDE0090 'new' expression can be simplified TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\PageService.cs 13 Active
Warning CS8600 Converting null literal or possible null value to non-nullable type. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\PageService.cs 28 Active
Warning CS8603 Possible null reference return. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\PageService.cs 40 Active
Warning CS8604 Possible null reference argument for parameter 'key' in 'bool Dictionary<string, Type>.ContainsKey(string key)'. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\Services\PageService.cs 50 Active
Warning IDE0074 Use compound assignment TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\ViewModels\ShellViewModel.cs 17 Active
Warning IDE0074 Use compound assignment TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\ViewModels\ShellViewModel.cs 19 Active
Warning IDE0074 Use compound assignment TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\ViewModels\ShellViewModel.cs 21 Active
Warning CS8618 Non-nullable field '_goBackCommand' must contain a non-null value when exiting constructor. Consider declaring the field as nullable. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\ViewModels\ShellViewModel.cs 23 Active
Warning CS8618 Non-nullable field '_loadedCommand' must contain a non-null value when exiting constructor. Consider declaring the field as nullable. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\ViewModels\ShellViewModel.cs 23 Active
Warning CS8618 Non-nullable field '_unloadedCommand' must contain a non-null value when exiting constructor. Consider declaring the field as nullable. TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\ViewModels\ShellViewModel.cs 23 Active
Warning CS8622 Nullability of reference types in type of parameter 'sender' of 'void ShellViewModel.OnNavigated(object sender, string viewModelName)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes). TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\ViewModels\ShellViewModel.cs 30 Active
Warning CS8622 Nullability of reference types in type of parameter 'sender' of 'void ShellViewModel.OnNavigated(object sender, string viewModelName)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes). TypeTracker2 C:\Users\leoru\Documents\CSProjects\TypeTracker2\ViewModels\ShellViewModel.cs 35 Active

To Reproduce

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Additional context

No response

Applies to the following platforms:

• WinUI
• WPF
• UWP

About your setup

• Visual Studio Version: 2022
• Template Studio Wizard Version: 5.3
• Windows Build: Win 10 Home 19045.3086