I am developing a SwiftUI based app (https://github.com/rsyncOSX/RsyncUI) which is localized to two languages, German and Norwegian. The development language is English. Running the app on a Norwegian macOS Montery works OK, the app shows the correct localization. Executing the app on an English macOS setup picks the German localization, and not the base localization which is English. And I don't know what causes the app to pick another language than English on a default English macOS setup....
I am experience this on macOS Monterey and Xcode 13, but also on macOS Big Sur and Xcode 12.5.1