Same here, while using emulator, but it happens only when i'm using my hardware keyboard. I have the same senderID as yours(778835616971358211) and my keyboard is Microsoft and USB connected. If i use emulator Software Keyboard the messages are not appearing. Probably no reason to be concerned.

This happened to me when using git clone command. From what i've read throw this thread this will happed when XCode has some available updates for the command line tools. By simply updating Xcode and all it's components the messages where gone This where the messages: Requested but did not find extension point with identifier Xcode.IDEKit.ExtensionSentinelHostApplications for extension Xcode.DebuggerFoundation.AppExtensionHosts.watchOS of plug-in com.apple.dt.IDEWatchSupportCore Requested but did not find extension point with identifier Xcode.IDEKit.ExtensionPointIdentifierToBundleIdentifier for extension Xcode.DebuggerFoundation.AppExtensionToBundleIdentifierMap.watchOS of plug-in com.apple.dt.IDEWatchSupportCore