I'm developing an iOS app with WatchKit app. When I build the main app with Xcode it installs on my iPhone and the WatchKit app installs on my Watch too. But when I remove the main app from my iPhone the WatchKit app isn't removed from my Watch and works fine.
I use iOS 12.0.1 and WatchOS 5.0.1. My iOS app's deployment target is 10.0 and WatchOS app's deployment target is 4.0.
I have tried to install my app via TestFlight and behaviour isn't changed. So I'm not sure if it is only "developers" bug. Or it isn't a bug at all?