I've found a strange thing with this I think you will all appreciate. I've noticed that you can't tap the notification, but I never knew about the double tap, I'll have to try that (Just tried, double tap doesn't work on notification....VZ here)
Anyways, I found that once you swipe the notification and then swipe again to go to a different lock screen page, that when you swipe back to the notification you can now just tap it once to open. So that's what the weirdness is. You should be able to just tap it once. You can alternatively just pull down the notification bar and tap the message.