I'm on 28244 now and I've called several contacts through the Sense Contacts tab and they are all still there after the fact.
I'll search around for other mentions of this issue and see if I can make any sense out of it.
I've already found some people in the same boat. From what little I've read, how you sync contacts might have something to do with it.
So those that are having this issue, how do you sync your contacts?