If a notification has the relevant flag set, the ANCS event should have positive/negative fields set as in https://www.espruino.com/Reference#l_E_ANCS - and if they are set then you should see the option to swipe.
So it could be a bug, but it might also be that your notifications just don't have the option available?
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Oh, ok - that's odd. iOS's ANCS has a method for positive/begative actions built in: https://developer.apple.com/library/archive/documentation/CoreBluetooth/Reference/AppleNotificationCenterServiceSpecification/Specification/Specification.html (search for EventFlagPositiveAction)
If a notification has the relevant flag set, the ANCS event should have positive/negative fields set as in https://www.espruino.com/Reference#l_E_ANCS - and if they are set then you should see the option to swipe.
So it could be a bug, but it might also be that your notifications just don't have the option available?