? I'm curious as well. I now have a wireless charger/holder in the car so with "OK Google" turned on I can activate it without even a button press, but it doesn't display what I asked for (it's behind the AOD or lock screen). When the screen is already on and I initiate OK Google and dictate a text, for example, it displays the content of what I dictated. With the screen off an initiating OK Google I don't see what I dictated, nor is it repeated back to me. It's a bit of a kludge really. Sometimes she asks me if I want to send, sometimes not (when the screen is off). Sometimes what I tried to do just "falls off the face of the earth".
Anyway, curious as to what button the OP was using...