See working solution here: https://stackoverflow.com/a/72521604/8478420
lovage
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There is an error in file /Applications/Xcode.app/Contents/Developer/Platforms/WatchOS.platform/Developer/Library/Xcode/PrivatePlugIns/IDEWatchSupportCore.ideplugin/Contents/Resources/IDEWatchSupportCore.xcplugindata
You should make its backup, then open it in plist editor and fully remove the following items:
Root/plug-in/extensions/Xcode.DebuggerFoundation.AppExtensionHosts.watchOS
Root/plug-in/extensions/Xcode.DebuggerFoundation.AppExtensionToBundleIdentifierMap.watchOS