Not sure if this is since 296.1, or the new API 27/28
but the string is not showing the $$$ amount anymore from the IAP.
it DOES show how much it is once you hit the Purchase button.
Did notice that the whole buying thing got changed from Android. so I am not sure if something got changed?
Here is a screen on how I have it, and this always worked..
I pulled up some of my existing games, and it's not showing anymore either.