I've never had anything except the create a new contact and type a new SMS. I've done three clean installs for other issues, and set up as new each time but am still to see any change.
I've seen the whole favorites thing happen on my phone previously. It's even reported on a few websites too: dunno what I'm doing wrong!!
http://www.gottabemobile.com/2015/0...-how-to-set-favorite-contacts-on-your-iphone/