Was it working on another ROM?
It was working on CM13 Sultan - this is the only ROM that I had previously installed over OOS 3.1.4, since last year.
Being a user since first release, comming from CM13 Sultan build I have to say that this is a very good rom, fast and reliable.
I found just a small issue.
On my lock screen, the bottom left icon is the dialer (I use "None" option in the Setting...