This is a known issue, as mentioned in another post of mine:
In other words, your friend needs to log out and log back in, otherwise he won’t see his updated contacts. It’s an unfortunate issue, but as I said, we can’t do much about it. Luckily it isn’t a permanent problem and will end when modernization is over with.
I’m sorry you lost some things, but this was a necessary step, and at least it won’t happen again. We can guarantee that this is the only time you will ever need to do this.