I'm having the same issue on my iPhone. Used to be able to send directions to listed phone number and it would show up on phone as message. Then just a couple days ago it disappeared. Now it sends to a phone icon which ends up as a notification. I would much rather have them sent to messages instead because I can always go back to that message and restart navigation. If someone calls when I'm following a route about half the time the navigation stops and doesn't restart. It's easy to go back to that message and restart. Notifications are gone.
Thinking this might be Google initiated change since poster below is having problem on PC with Chrome and I am having exact same problem on Mac using Firefox.