I got a few reports about it, but can't reproduce on any of my phones or tablets... I mean any difference compared to older versions.
But please be aware that Android can "collapse" notifications with buttons or message previews, hiding the buttons.
To expand a collapsed notification, pull down the notification area, and "zoom out" the notification, with two fingers, horizontally.
If this makes the buttons show -- it means Aqua did put them there, but Android decided to collapse them.
Happens to all apps, including Google's own, depending on how crowded the notification area is (since Android 4.1 where this feature debuted).