I have this test code

import SwiftUI

struct TestAppleSuggestion: View {
   
    @Environment(\.locale) var locale: Locale
 
    var body: some View {
        VStack {
           
            VStack {
                Text("locale: \(locale.identifier)")
                Text(AttributedString(localized: LocalizedStringResource(
                    "welcome",
                    locale: locale
                )))
                Text(AttributedString(localized:
                    "welcome",
                    locale: locale
                ))
            }

        }
    }

}

#Preview {
    TestAppleSuggestion().environment(\.locale, Locale(identifier: "fr-CA"))
}

Heres what I see in SwiftUi Preview

As you can see, applying the locale to LocalizedStringResource works but directly to the AttributedString does not.

I am confused why localization is working for some api and not other.

I would like to just apply localization directly to AttributedString as I don't actually need the LocalizationStringResource.