Hi Emma,
OH got state sponsorship from Vic government in early last year and we got our visa approval in mid December. CO didn't mention anything to us about the State changing their minds. We even got a congratulatory email from the Vic government a few days after our visa approval email, which was really nice of them!
I'm sure it's more of a final check to make sure everything is in place. Don't fret too much - the end is very near!!
Keeping my fingers and toes crossed that you hear back from your CO very soon with great news
