I don't know if it is a "solution necessarily, but we had this same issue with multiple listings recently and we ended up getting around the problem.
So each of the listings had multiple photos uploaded (even new cover/logo photos set) and none of it was showing out on the KP- it was still just the streetview and the same old 2/3 photos that were already there previously. We deleted what we uploaded that wasn't going live, then re-sized the photos to be 720x720 and reuploaded them. Each listing that we did this one had the photos showing out on the KP within ~1 hour roughly.
So it doesn't solve the root issue really, but it did accomplish the goal of getting the photos published.