I have an app that uses Swift 4.2. I am going to update the Swift Compiler Language to Swift 5. But I have some confusion after my test. I was able to run async/await code when using Xcode 15 with the version set to Swift 4.2, and it was okay. But async/await code was developed in Swift5.5. Why it is okay? Is it related to the Xocde Swift version? And if I use Swift Compiler version 4.2 to run async/await code,what problems might there be ?

I understand that TodayExtension will be deprecated in iOS 18, and we have integrated WidgetKit into our app. However, we have encountered some issues during the app update process. Specifically, we noticed that the TodayExtension might not appear in the tools list or sometimes the TodayExtension appear "Unable to Load" Could you please advise on the possible causes of this issue? Is there a way to resolve it if we want to keep both types of widgets active?