Message filter extension doesn't run on iOS 18

If I run an app with a message filter extension on < iOS 18 everything is as expected, if I run the same app, without any changes on iOS 18 then it doesn't work.

I've discovered that problems occur if the extension has the following code:

extension MessageFilterExtension: ILMessageFilterQueryHandling, ILMessageFilterCapabilitiesQueryHandling {
    func handle(_ capabilitiesQueryRequest: ILMessageFilterCapabilitiesQueryRequest, context: ILMessageFilterExtensionContext, completion: @escaping (ILMessageFilterCapabilitiesQueryResponse) -> Void) {
      
      let response = ILMessageFilterCapabilitiesQueryResponse()
      
      response.transactionalSubActions = [.transactionalCarrier, .transactionalHealth, .transactionalPublicServices, .transactionalFinance, .transactionalWeather, .transactionalRewards, .transactionalOrders, .transactionalOthers, .transactionalReminders]

      
      response.transactionalSubActions = [.transactionalFinance,
                                          .transactionalOrders,
                                          .transactionalHealth]
      completion(response)
    }

This code doesn't run on iOS 18, however the following code does run on iOS 18:

      let response = ILMessageFilterCapabilitiesQueryResponse()
      completion(response)

I downloaded several apps from the app store which provide message filtering, within the Message app they all had one thing in common, on < iOS 18 they all show 12 filtering categories, but within iOS 18 they only show 2. So it seems the issue is endemic and effects other apps, not just mine.