As it says. They were there in last update but now all seem to be missing.
Same thing happening on Android. They were all there in the newest update though, so it seems to be a server side bug.
EDIT: And they have returned. @PkmnTrainerJ, can you check if your buttons are there as well?
These all seem to back now so that was a weird bug.
As it seems to disappear and reappear for everyone at the same time, I assume Niantic tweaked some things on the servers, which hid the buttons for a short while.