I started a game with them yesterday. Their growth didn't seem right, but I was thinking it was adjusted slightly in one of the recent updates. I decided today it wasn't right, so I checked the same way I did much earlier when I found it wasn't working. That was fixed and has been fixed for a while.
I just finished testing in 1.01.343914b on TEST. It is definitely broken again. Promethion does nothing to growth.
This has been added to the Feedback thread.