When building and running an app on iOS 18.1 Beta 3 a fresh sample app with an @AssistantIntent will immediately crash. Using a sample Assistant Intent from the developer documentation site will cause this. Removing the @AssistantIntent macro will allow the app to run. Using Xcode 16.1 beta.
dyld[1278]: Symbol not found: _$s10AppIntents15AssistantSchemaV06IntentD0VAC0E0AAWP Referenced from: <DC018008-EC0E-3251-AAFC-5DEB51863F17> /private/var/containers/Bundle/Application/2726C2CE-0255-4692-A7CA-B343146D4A83/Runner.app/Runner.debug.dylib Expected in: <E9AF073B-B6E0-31B8-88AA-092774CEEE3D> /System/Library/Frameworks/AppIntents.framework/AppIntents
(FB14949135)