Game Center login windows popups after hiding an app

Hey guys,

I found this strange bug in unity or apple not really sure. So, apple gives only one attempt to login in game center acc, right? But following steps force login popup twice

1. start a game

2. call Social.Authenticate

3. cancel gc login

4. hide an app

5. open an app again

6. game center popup show again

the real problem here is that my callback I pass to authenticate is not being called, meaning that I have no control over game center answers.

anybody heard anything about the issue or any workarounds? would appreciate any info