When the user leaves the app but does not close it, the app goes in the background, and when they reopen it, it goes into foreground again without restart. Isn’t this your applicationResumeTime? This would explain the hours-long times 😉

Just a quick answer before I post a long one: I also stumbled upon this problem, and I managed to create a Minimal Reproductible Example. I'm going to create a GitHub repository with information and all, but basically the steps are: (Running XCode Version 13.2.1 (13C100)) Create a fresh SwiftUI app Edit the main App to match import SwiftUI import CoreLocationUI @main struct CLLocationButtonTesterApp: App { var body: some Scene { WindowGroup { LocationButton(action: {}) } } } Run the app → no problem Create an empty file Add French localization to the app Add French localization to the file (you can even remove any other *.lproj folder) Run the app → you get Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: width && height' terminating with uncaught exception of type NSException CoreSimulator 783.5 - Device: iPhone 13 (B8BF9672-9A4F-4E59-83EC-4844992B74C4) - Runtime: iOS 15.2 (19C51) - DeviceType: iPhone 13 Tip: Clean the build folder between each test, otherwise you might encounter caching issues 😉