Looking at the SoupChef example. I can clearly state that deferredLocalizedIntentsString does not work correctly. I only see the "ORDERSOUPSUGGESTEDPHRASE" placeholder in the "Add to Siri" UI.
In Console I can see sandbox violation errors, the same is happening to my app:
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/Base.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/Base.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/Base.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/Base.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/Base.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/Base.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/Base.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/Base.lproj
error kernel Sandbox: AddShortcutExten(1686) deny(1) file-read-data /private/var/containers/Bundle/Application/299F6C5D-A3AB-4F6C-98A3-AAC05C581B63/SoupChef.app/en.lproj
error AddShortcutExtension Unable to simultaneously satisfy constraints.
error AddShortcutExtension -[INCExtensionProxy getDefaultValueForParameterNamed:completionHandler:]blockinvoke2 Error getting default value for parameter name: <private> - Error Domain=INExtensionContextErrorDomain Code=1003
error AddShortcutExtension -[WFDynamicEnumerationParameter defaultSerializedRepresentation]blockinvoke2 Error loading default serialized representation for dynamic enumeration: <private>
error AddShortcutExtension -[INCExtensionProxy getDefaultValueForParameterNamed:completionHandler:]blockinvoke2 Error getting default value for parameter name: <private> - Error Domain=INExtensionContextErrorDomain Code=1003
error AddShortcutExtension -[WFDynamicEnumerationParameter defaultSerializedRepresentation]blockinvoke2 Error loading default serialized representation for dynamic enumeration: <private>
error AddShortcutExtension -[INCExtensionProxy getDefaultValueForParameterNamed:completionHandler:]blockinvoke2 Error getting default value for parameter name: <private> - Error Domain=INExtensionContextErrorDomain Code=1003
error AddShortcutExtension -[WFDynamicEnumerationParameter defaultSerializedRepresentation]blockinvoke2 Error loading default serialized representation for dynamic enumeration: <private>