Fail to find resources from within non-primary ResourceDictionary

[artkat]

Describe the bug

App throws 'XAML parsing failed' 'Cannot find resource with the Name/Key...' when trying to lookup a default value (brush) or custom theme resource value (color or brush) from with a resource dictionary other than app.xaml.

Seems the app is not able to resolve resources referenced in additional (non App.xaml) resource dictionaries. Neither the standard WinUI control styles/resources, nor the theme resources defined in App.xaml can be resolved.

Sample code to demonstrate this issue can be found on GitHub: https://github.com/artkat/WinUIResourcesTest

Steps to reproduce the bug

1. Download and compile/run sample from https://github.com/artkat/WinUIResourcesTest - it will crash with said exception
2. First error is in FirstResourceDictionary.xaml - when Microsoft.UI.Xaml.Controls is included (marked-out block), it will not crash on this
3. Second error is in SecondResourceDictionary - MyBrush, which is defined as an app.xaml theme resource, cannot be found.

Expected behavior

Should run fine and be able to find the resources.

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.4.0: 1.4.230822000

Windows version

Windows 11 (22H2): Build 22621

Additional context

No response

[DarranRowe]

Just to let you know, as of the time of writing, your linked repo only has a .gitignore file.

[artkat]

@DarranRowe oops. Thanks. Forgot to push the repo. Should be there now

[shane-vorwerk]

I am also running into issues with resources not working as expected. I created a control in code derived from ContentDialog and was not able to apply any styles to it.

[Xo3-ToBapbl]

Please, try to add more than one style to your recourse dictionary. In my case I had the same exception with only ONE style in resource dictionary, but when I added another style, everything worked as expected.

FYI: I've already seen similar issue, and it's a shame that MS can't fix this for years. And as usual, after months, silence is the answer.